Differences between revisions 1 and 21 (spanning 20 versions)

Electric Fields and Potential

PIRA Classification 5B

Grayed Demos are either not available or haven't been built yet

5B10. Electric Fields

PIRA #	Demonstration Name	Abstract
5B10.10	hair on end	While standing on an insulated stool, charge yourself up with a Van de Graaff generator.
5B10.11	hair on end	Charge Van de Graaff generator with a Wig on the dome and without grounding ball.
5B10.13	pithball plate and flying balls	Place a plate with pith ball hanging on strings on an electrostatic generator. Also place a cup filled with styrofoam balls on an electrostatic generator.
5B10.15	Van de Graaff streamers	Attach ribbon streamers to the top of a Van de Graaff generator.
5B10.15	Van de Graaff streamers	A small stand with thin paper strips is placed on an electrostatic generator.
5B10.15	Van de Graaff with streamers	Show Van de Graaff with paper streamers, then hair on end.
5B10.16	recoiling tentacles	Place the electrostatic plume made out of nylon rope near the other terminal of the Wimshurst machine.
5B10.21	electric rosin	Melt rosin in a metal ladle and attach to a static machine. When the machine is cranked and the rosin slowly poured out, jets of rosin follow the electric field.
5B10.22	electrostatic painting	Clip the can to ground and a metal object to be painted to the Van de Graaff generator. Point out that the paint goes around to the back too, and it is thickest on the edges.
5B10.23	MgO smoke	Fill an unevacuated bell jar with MgO smoke and they will form three dimensional chain-like agglomerates between electrodes.
5B10.23	orbiting foil	Throw a triangle of aluminum foil into the field of a Van der Graaff and it comes to equilibrium mid-air. Give it a half-twist, and it will orbit in a horizontal circle below the sphere.
5B10.24	charge motion in an electric field	A charged ball on a dry ice puck is launched toward a Van de Graaff generator. The motion is recorded with strobe photography.
5B10.25	confetti (puffed wheat)	Confetti (puffed wheat, styrofoam peanuts) flies off the ball of an electrostatic generator.
5B10.25	confetti on electrostatic generator	Confetti flies off the ball of an electrostatic generator.
5B10.25	streamers	Fray the end of a nylon clothesline and charge with an electrostatic machine to show repulsion.
5B10.26	eletrified strings	A bunch of hanging nylon strings are charged by stroking with cellophane causing repulsion.
5B10.26	electrified strings	Charge a mop of insulating strings.
5B10.26	shooting down charge	Use the piezoelectric pistol to discharge the electrified strings.
5B10.30	electric chimes	A ball bounces between charged metal chimes.
5B10.30	electric chimes	Insert a metalized ping-pong ball between two highly charged metal plates.
5B10.30	electric chimes	A small metal ball hangs on a thread between two bells attached to an electrostatic machine.
5B10.30	electrostatic ping-pong balls	Conductive ping pong balls bounce between horizontal plates charged with a Wimshurst.
5B10.31	jumping particles	Aluminum powder bounces between two horizontal plates 1 cm apart attached to a static machine. Metalized pith balls bounce between an electrode at the top of a bell jar and the plate.
5B10.32	Van de Graaff chime	Toss a small foil near the charged sphere (see AJP 32(1),xiv - 5B10.33) and then bring a grounded ball close to show the chime effect.
5B10.33	electrostatic ping-pong	A fluffy cotton ball travels back and forth between an electrostatic generator and a lighted cigar.
5B10.35	electrostatic ping pong	Bounce a conducting ball hanging between two plates charged with a Wimshurst.
5B10.40	fuzzy fur field tank	"Fur" in mineral oil aligns along field lines from charged electrodes.
5B10.40	"velveteens"	Fine black fiber clippings in castor oil are used to show electric field between electrodes.
5B10.40	electric fields between electrodes	Charged electrodes are placed in a tank of mineral oil containing velveteen and the pattern is projected on the overhead.
5B10.40	fuzzy fur field tank	Bits of material suspended in oil align with an applied electric field. Several pole arrangements are shown.
5B10.40	electric field	A pan on the overhead projector contains particles in a liquid that align with the electric field.
5B10.41	repelled air bubbles	A stream of air bubbles in an oil bath are repelled in the region of an inhomogeneous field.
5B10.42	epsom salt on plate	Sprinkle Epson salt on a glass plate with two aluminum electrodes. Tap to align the crystals.
5B10.43	ice filament growth	An ice filament pattern shows the electrical field configuration. Place a PZT transducer on a block of dry ice.
5B10.50	mapping force with "electric doublet	Two pith balls charged oppositely and hanging from a rod are used to map out the field in the region of charged conductors.
5B10.51	plotting equipotential lines	A method for plotting equipotential lines from electrodes in a pan on water.
5B10.52	finger on the electrophorus	Charge and electrophorus., then trace a circle on it with your finger and probe the resulting field with a pith ball on a long thread.
5B10.53	extent of electric field	Hold an electroscope several feet away from a static machine and observe the electroscope leaves rise and fall as sparking occurs.
5B10.54	mapping field potential, voltage	A wire held in the flame of a candle and attached to a grounded electroscope is held near a Van de Graaff generator. Mount two candles on a insulator and attach the second to the case of the electroscope to measure voltage.
5B10.54	mapping potential field	A small alcohol lamp attached to an electrostatic voltmeter can be used to map potential fields.
5B10.55	liquid crystal mapping	An electrode configuration is painted onto a conducting paper with temperature sensitive encapsulated liquid crystals. Joule heating causes color changes.
5B10.55	liquid crystal mapping	An alternate method (to AJP 41(12),1314) of preparing liquid crystal displays of electric fields.
5B10.57	double brass plate measurement	The field around a large sphere is measured by separating two brass plates and measuring the charges with a ballistic galvanometer.
5B10.58	electric field indicator	A point on the end of a 500 Mohm resistor connects to a neon bulb in parallel with a small capacitor.
5B10.60	electric fields of currents	Current carrying conductors are made of transparent conducting ink on glass plates. Sprinkle on grass seeds to demonstrate the electric lines of force inside and outside the conducting elements.
5B10.61	electric fields of currents	Draw a circuit on glass or mylar with a soft lead scoring pencil. Dust the glass with small fibers while the current is flowing.
5B10.62	water drop model of charged particle	A water drop model demonstrates the motion of a stream of charged particles in an electric field.
5B10.70	other surfaces	see 8C20.20,1L20.10
5B10.70	rubber sheet model for fields	Roll balls over a 6'x4' frame with a stretched rubber surface, distorting it with dowels to represent charges.
5B10.70	model of field potential	A sheet of rubber is pushed up and down with dowels to represent positive and negative charges.
5B10.71	stretched membrane field model	A rubber sheet stretched over a large quilting hoop models electric fields.

5B10.30 [:ElectrostaticBells:Electrostatic Bells]
5B10.31 [:VoltasHailstorm:Volta's Hailstorm]
5B10.45 [:ElectricHair:Electric Hair]

5B20. Gauss' Law

PIRA #	Demonstration Name	Abstract
DCS #	DEMONSTRATION	ABSTRACT
5B20.10	Faraday's ice pail	While standing on an insulated stool, charge yourself up with a Van de Graaff generator.
5B10.11	Faraday's ice pail	Charge Van de Graaff generator with a Wig on the dome and without grounding ball.
5B20.10	Faraday ice pail	Charge a bucket with a Wimshurst and transfer charge from the inside and outside of the bucket to an electroscope.
5B20.11	big Faraday ice pail	A 55 gal. drum Faraday ice pail and other stuff.
5B20.12	Faraday ice pail	A Faraday ice pail made of two concentric wire mesh cylinders connected to a Braun electroscope.
5B20.15	Faraday's ice pail on electroscope	A charged metal pail sits on an electroscope. A proof plane transfers charge from the inside or outside to another electroscope.
5B20.15	butterfly net experiment	Turn a charged butterfly net inside out and the charge is still on the outside.
5B20.16	Faraday ice pail on electroscope	A charged copper beaker placed on an electroscope is touched on the outside or inside with a proof plane.
5B20.30	sheilded electroscope	A charged rod is brought close to a gold leaf electroscope in a wire mesh cage.
5B20.30	electroscope in a cage	Enclose an electroscope in a cage of heavy wire screening.
5B20.30	Faraday cage	Bring a charged rod near a Braun electroscope, then cover the electroscope with a wire mesh cage and repeat.
5B20.31	electroscope in a cage on Wimshurst	A screen cage shields an electroscope from a charged rod.
5B20.33	pith balls in a cage	Metal coated pith balls are suspended inside and outside of a metal screen cylinder attached to a electrostatic machine.
5B20.35	radio in a cage	Place a wire mesh cage over a radio.
5B20.35	radio in Faraday cage	Place a wire mesh cage over a radio.
5B20.36	VTVM in a cage	Mount the inputs to a VTVM in a Faraday cage. Show charge transfer from plastic strips.
5A20.28	beer can pith balls	Aluminum beer cans are used instead of pith balls to show repulsion of like charges.
5A20.30	Myar balloon electroscope	Balloon electroscopes, helium filled or normal, can be painted with aluminum and charged with a Van de Graaff.
5A20.30	balloons on Van de Graaff	Tape mylar balloons on conducting strings to a Van de Graaff generator.
5A20.30	Van de Graaff repulsion	Hang an aluminized balloon is hung from a rod attached to the Van de Graaff electrode to demonstrate repulsion of like charges.
5A20.32	electrostatic spheres on air table
5A20.35	Coulomb's law balance	The PSSC soda straw balance is adapted to make a simple Coulomb's law balance.
5A20.40	aluminum sheet electroscope	Two squares of aluminum foil are suspended from wires across a glass rod.
5A20.41	large leaf electroscope	A 15" length of 1 1/2" mylar tape is suspended along a brass strip.
5A20.50	measuring Coulomb's law	An optical lever and damper make this apparatus useful to demonstrate Coulomb's law. Diagram, Construction details in appendix, p. 1311.

5B20.10 [:FaradayIcePail:Faraday Ice Pail]
5B20.30 [:FaradayCage:Faraday Cage]
5B20.34 [:GaussLaw:Gauss's Law]
5B20.35 [:RadioInACage:Radio In A Cage]

5B30. Electrostatic Potential

5B30.00 [:ElectrostaticRollerBall:Electrostatic Roller Ball]
5B30.20 [:CavendishSpheres:Cavendish Spheres]
5B30.20 [:ChargeDistributionSpheres:Charge Distribution on Conducting Spheres]
5B30.20 [:ZeppelinCharge:Charge Distribution on a Conducting Surface]
5B30.30 [:LightningRod:Lightning Rod]
5B30.40 [:ElectricWind:Electric Wind]
5B30.50 [:ElectrostaticPinwheel:Electrostatic Pinwheel]
5B30.60 [:CottrellPrecipitator:Cottrell Precipitator]

[:Demonstrations:Demonstrations]

[:Instructional:Home]

-  ⇤ ← Revision 1 as of 2008-04-23 16:18:05 → 
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-= Electric Fields and Potential =
+#acl reardon:read,write,delete,revert,admin FacultyGroup:read,write All:read
== Electric Fields and Potential ==
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-PIRA Classification 5B
+''PIRA Classification 5B''
||<#dddddd> Grayed Demos are either not available or haven't been built yet||
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- * 5B10.30 [:VoltasHailstorm:Volta's Hailstorm]
+= 5B10. Electric Fields =

||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
||	5B10.10	||	hair on end	||	While standing on an insulated stool, charge yourself up with a Van de Graaff generator.	||
||	5B10.11	||	hair on end	||	Charge Van de Graaff generator with a Wig on the dome and  without grounding ball.	||
||	5B10.13	||	pithball plate and flying balls	||	Place a plate with pith ball hanging on strings on an electrostatic generator. Also place a cup filled with styrofoam balls on an electrostatic generator.	||
||	5B10.15	||	Van de Graaff streamers	||	Attach ribbon streamers to the top of a Van de Graaff generator.	||
||	5B10.15	||	Van de Graaff streamers	||	A small stand with thin paper strips is placed on an electrostatic generator.	||
||	5B10.15	||	Van de Graaff with streamers	||	Show Van de Graaff with paper streamers, then hair on end.	||
||	5B10.16	||	recoiling tentacles	||	Place the electrostatic plume made out of nylon rope near the other terminal of the Wimshurst machine.	||
||	5B10.21	||	electric rosin	||	Melt rosin in a metal ladle and attach to a static machine. When the machine is cranked and the rosin slowly poured out, jets of rosin follow the electric field.	||
||	5B10.22	||	electrostatic painting	||	Clip the can to ground and a metal object to be painted to the Van de Graaff generator. Point out that the paint goes around to the back too, and it is thickest on the edges.	||
||	5B10.23	||	MgO smoke	||	Fill an unevacuated bell jar with MgO smoke and they will form three dimensional chain-like agglomerates between electrodes.	||
||	5B10.23	||	orbiting foil	||	Throw a triangle of aluminum foil into the field of a Van der Graaff and it comes to equilibrium mid-air. Give it a half-twist, and it will orbit in a horizontal circle below the sphere.	||
||	5B10.24	||	charge motion in an electric field	||	A charged ball on a dry ice puck is launched toward a Van de Graaff generator. The motion is recorded with strobe photography.	||
||	5B10.25	||	confetti (puffed wheat)	||	Confetti (puffed wheat, styrofoam peanuts) flies off the ball of an electrostatic generator.	||
||	5B10.25	||	confetti on electrostatic generator	||	Confetti flies off the ball of an electrostatic generator.	||
||	5B10.25	||	streamers	||	Fray the end of a nylon clothesline and charge with an electrostatic machine to show repulsion.	||
||	5B10.26	||	eletrified strings	||	A bunch of hanging nylon strings are charged by stroking with cellophane causing repulsion.	||
||	5B10.26	||	electrified strings	||	Charge a mop of insulating strings.	||
||	5B10.26	||	shooting down charge	||	Use the piezoelectric pistol to discharge the electrified strings.	||
||	5B10.30	||	electric chimes	||	A ball bounces between charged metal chimes.	||
||	5B10.30	||	electric chimes	||	Insert a metalized ping-pong ball between two highly charged metal plates.	||
||	5B10.30	||	electric chimes	||	A small metal ball hangs on a thread between two bells attached to an electrostatic machine.	||
||	5B10.30	||	electrostatic ping-pong balls	||	Conductive ping pong balls bounce between horizontal plates charged with a Wimshurst.	||
||	5B10.31	||	jumping particles	||	Aluminum powder bounces between two horizontal plates 1 cm apart attached to a static machine. Metalized pith balls bounce between an electrode at the top of a bell jar and the plate.	||
||	5B10.32	||	Van de Graaff chime	||	Toss a small foil near the charged sphere (see AJP 32(1),xiv - 5B10.33) and then bring a grounded ball close to show the chime effect.	||
||	5B10.33	||	electrostatic ping-pong	||	A fluffy cotton ball travels back and forth between an electrostatic generator and a lighted cigar.	||
||	5B10.35	||	electrostatic ping pong	||	Bounce a conducting ball hanging between two plates charged with a Wimshurst.	||
||	5B10.40	||	fuzzy fur field tank	||	"Fur" in mineral oil aligns along field lines from charged electrodes.	||
||	5B10.40	||	"velveteens"	||	Fine black fiber clippings in castor oil are used to show electric field between electrodes.	||
||	5B10.40	||	electric fields between electrodes	||	Charged electrodes are placed in a tank of mineral oil containing velveteen and the pattern is projected on the overhead.	||
||	5B10.40	||	fuzzy fur field tank	||	Bits of material suspended in oil align with an applied electric field. Several pole arrangements are shown.	||
||	5B10.40	||	electric field	||	A pan on the overhead projector contains particles in a liquid that align with the electric field.	||
||	5B10.41	||	repelled air bubbles	||	A stream of air bubbles in an oil bath are repelled in the region of an inhomogeneous field.	||
||	5B10.42	||	epsom salt on plate	||	Sprinkle Epson salt on a glass plate with two aluminum electrodes. Tap to align the crystals.	||
||	5B10.43	||	ice filament growth	||	An ice filament pattern shows the electrical field configuration. Place a PZT transducer on a block of dry ice.	||
||	5B10.50	||	mapping force with "electric doublet	||	Two pith balls charged oppositely and hanging from a rod are used to map out the field in the region of charged conductors.	||
||	5B10.51	||	plotting equipotential lines	||	A method for plotting equipotential lines from electrodes in a pan on water.	||
||	5B10.52	||	finger on the electrophorus	||	Charge and electrophorus., then trace a circle on it with your finger and probe the resulting field with a pith ball on a long thread.	||
||	5B10.53	||	extent of electric field	||	Hold an electroscope several feet away from a static machine and observe the electroscope leaves rise and fall as sparking occurs.	||
||	5B10.54	||	mapping field potential, voltage	||	A wire held in the flame of a candle and attached to a grounded electroscope is held near a Van de Graaff generator. Mount two candles on a insulator and attach the second to the case of the electroscope to measure voltage.	||
||	5B10.54	||	mapping potential field	||	A small alcohol lamp attached to an electrostatic voltmeter can be used to map potential fields.	||
||	5B10.55	||	liquid crystal mapping	||	An electrode configuration is painted onto a conducting paper with temperature sensitive encapsulated liquid crystals. Joule heating causes color changes.	||
||	5B10.55	||	liquid crystal mapping	||	An alternate method (to AJP 41(12),1314) of preparing liquid crystal displays of electric fields.	||
||	5B10.57	||	double brass plate measurement	||	The field around a large sphere is measured by separating two brass plates and measuring the charges with a ballistic galvanometer.	||
||	5B10.58	||	electric field indicator	||	A point on the end of a 500 Mohm resistor connects to a neon bulb in parallel with a small capacitor.	||
||	5B10.60	||	electric fields of currents	||	Current carrying conductors are made of transparent conducting ink on glass plates. Sprinkle on grass seeds to demonstrate the electric lines of force inside and outside the conducting elements.	||
||	5B10.61	||	electric fields of currents	||	Draw a circuit on glass or mylar with a soft lead scoring pencil. Dust the glass with small fibers while the current is flowing.	||
||	5B10.62	||	water drop model of charged particle	||	A water drop model demonstrates the motion of a stream of charged particles in an electric field.	||
||	5B10.70	||	other surfaces	||	see 8C20.20,1L20.10	||
||	5B10.70	||	rubber sheet model for fields	||	Roll balls over a 6'x4' frame with a stretched rubber surface, distorting it with dowels to represent charges.	||
||	5B10.70	||	model of field potential	||	A sheet of rubber is pushed up and down with dowels to represent positive and negative charges.	||
||	5B10.71	||	stretched membrane field model	||	A rubber sheet stretched over a large quilting hoop models electric fields.	||
-Line 7:
+Line 64:
+ * 5B10.31 [:VoltasHailstorm:Volta's Hailstorm]
-Line 8:
+Line 68:
+= 5B20. Gauss' Law =

||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
||	DCS #	||	DEMONSTRATION	||	ABSTRACT	||
||	5B20.10	||	Faraday's ice pail	||	While standing on an insulated stool, charge yourself up with a Van de Graaff generator.	||
||	5B10.11	||	Faraday's ice pail	||	Charge Van de Graaff generator with a Wig on the dome and  without grounding ball.	||
||	5B20.10	||	Faraday ice pail	||	Charge a bucket with a Wimshurst and transfer charge from the inside and outside of the bucket to an electroscope.	||
||	5B20.11	||	big Faraday ice pail	||	A 55 gal. drum Faraday ice pail and other stuff.	||
||	5B20.12	||	Faraday ice pail	||	A Faraday ice pail made of two concentric wire mesh cylinders connected to a Braun electroscope.	||
||	5B20.15	||	Faraday's ice pail on electroscope	||	A charged metal pail sits on an electroscope. A proof plane transfers charge from the inside or outside to another electroscope.	||
||	5B20.15	||	butterfly net experiment	||	Turn a charged butterfly net inside out and the charge is still on the outside.	||
||	5B20.16	||	Faraday ice pail on electroscope	||	A charged copper beaker placed on an electroscope is touched on the outside or inside with a proof plane.	||
||	5B20.30	||	sheilded electroscope	||	A charged rod is brought close to a gold leaf electroscope in a wire mesh cage.	||
||	5B20.30	||	electroscope in a cage	||	Enclose an electroscope in a cage of heavy wire screening.	||
||	5B20.30	||	Faraday cage	||	Bring a charged rod near a Braun electroscope, then cover the electroscope with a wire mesh cage and repeat.	||
||	5B20.31	||	electroscope in a cage on Wimshurst	||	A screen cage shields an electroscope from a charged rod.	||
||	5B20.33	||	pith balls in a cage	||	Metal coated pith balls are suspended inside and outside of a metal screen cylinder attached to a electrostatic machine.	||
||	5B20.35	||	radio in a cage	||	Place a wire mesh cage over a radio.	||
||	5B20.35	||	radio in Faraday cage	||	Place a wire mesh cage over a radio.	||
||	5B20.36	||	VTVM in a cage	||	Mount the inputs to a VTVM in a Faraday cage. Show charge transfer from plastic strips.	||
||	5A20.28	||	beer can pith balls	||	Aluminum beer cans are used instead of pith balls to show repulsion of like charges.	||
||	5A20.30	||	Myar balloon electroscope	||	Balloon electroscopes, helium filled or normal, can be painted with aluminum and charged with a Van de Graaff.	||
||	5A20.30	||	balloons on Van de Graaff	||	Tape mylar balloons on conducting strings to a Van de Graaff generator.	||
||	5A20.30	||	Van de Graaff repulsion	||	Hang an aluminized balloon is hung from a rod attached to the Van de Graaff electrode to demonstrate repulsion of like charges.	||
||	5A20.32	||	electrostatic spheres on air table	||		||
||	5A20.35	||	Coulomb's law balance	||	The PSSC soda straw balance is adapted to make a simple Coulomb's law balance.	||
||	5A20.40	||	aluminum sheet electroscope	||	Two squares of aluminum foil are suspended from wires across a glass rod.	||
||	5A20.41	||	large leaf electroscope	||	A 15" length of 1 1/2" mylar tape is suspended along a brass strip.	||
||	5A20.50	||	measuring Coulomb's law	||	An optical lever and damper make this apparatus useful to demonstrate Coulomb's law. Diagram, Construction details in appendix, p. 1311.	||


 * 5B20.10 [:FaradayIcePail:Faraday Ice Pail]

 * 5B20.30 [:FaradayCage:Faraday Cage]

 * 5B20.34 [:GaussLaw:Gauss's Law]

 * 5B20.35 [:RadioInACage:Radio In A Cage]

'''5B30. Electrostatic Potential'''
-Line 9:
+Line 110:
+ * 5B30.20 [:CavendishSpheres:Cavendish Spheres]

 * 5B30.20 [:ChargeDistributionSpheres:Charge Distribution on Conducting Spheres]

 * 5B30.20 [:ZeppelinCharge:Charge Distribution on a Conducting Surface]

 * 5B30.30 [:LightningRod:Lightning Rod]

 * 5B30.40 [:ElectricWind:Electric Wind]
-Line 10:
+Line 122:
-Line 15:
+Line 128:

fw: Diff for "ElectricFieldsAndPotential"

Electric Fields and Potential

5B10. Electric Fields

5B20. Gauss' Law