#acl reardon:read,write,delete,revert,admin FacultyGroup:read,write All:read == Electric Fields and Potential == ''PIRA Classification 5B'' ||<#dddddd>Grayed Demos are either not available or haven't been built yet || ''''' Please note that these tables have not yet been edited to match the equipment that is available within the UW-Madison lecture demo lab. There maybe many items listed within these tables that we either "can not do" or have available.''''' <> = 5B10. Electric Fields = ||<10% style="" & quot; & amp; quot;text-align:center& amp; quot; & quot; " ">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets''' ||<60% style="" & quot; & amp; quot;text-align:center& amp; quot; & quot; " ">'''Abstract''' || ||5B10.10 ||hair on end ||pira200 ||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. || ||5B10.39 ||Electric Field Lines with Horse Hair || || || ||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 ||pira200 ||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]] * 5B10.39 [[ElectricHair|Electric Field Lines with Horse Hair]] <> = 5B20. Gauss' Law = ||<10% style="" & quot; & amp; quot;text-align:center& amp; quot; & quot; " ">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets''' ||<60% style="" & quot; & amp; quot;text-align:center& amp; quot; & quot; " ">'''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 ||pira200 ||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 ||pira200 ||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 = ||<10% style="" & quot; & amp; quot;text-align:center& amp; quot; & quot; " ">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets''' ||<60% style="" & quot; & amp; quot;text-align:center& amp; quot; & quot; " ">'''Abstract''' || ||DCS # ||DEMONSTRATION || ||ABSTRACT || ||5B30.10 ||surface charge density - balls || ||While standing on an insulated stool, charge yourself up with a Van de Graaff generator. || ||5B10.11 ||charged ovoid || ||Charge Van de Graaff generator with a Wig on the dome and without grounding ball. || ||5B30.20 ||surface charge density || ||Proof planes of the same area take charge from the flat or pointed end of a charged zeppelin shaped conductor. || ||5B30.20 ||charged Zeppelin || ||Use a proof plane and electroscope to compare charge densities at different points on a egg shaped conductor. || ||5B30.22 ||charge distribution on spheres || ||Read this one. Determine the charge distribution as spheres are brought close to a charged sphere. || ||5B30.24 ||surface charge density with cans || ||Transfer charge from the edge of a can on a source to the inside of a second can. || ||5B30.25 ||charge on spheres || ||Spheres of different diameters are brought to the same potential and inserted into a Faraday ice pail to show different charges. || ||5B30.26 ||spark gaps || ||Connect an electrostatic voltmeter to the terminals of an static machine and observe the voltage while varying the spark gap. || ||5B30.27 ||measure the second derivative of pot || ||A two point probe measures potential, and a five point probe measures the second derivative of potential. Diagram. || ||5B30.28 ||potential during discharge || ||An electroscope is connected to the ball of the electric chime to observe the decrease on potential as the ringing diminishes. || ||5B30.30 ||lightning rod || ||Insert a sphere and point of the same height between horizontal metal plates charged by a Wimshurst. || ||5B30.30 ||lightning rod || ||Insert a sphere and point of the same height between horizontal metal plates charged by a Wimshurst. || ||5B30.30 ||lightning rod || ||Sparks jumping from a plane to a sphere will stop when a point is inserted. || ||5B30.30 ||lightning rod || ||Sparks discharge from a large ball suspended over a model house with a small ball in the chimney until a point is raised above the small ball. || ||5B30.35 ||point and ball with Van de Graaf ||pira200 ||Hold a ball close to a Van de Graaff generator and then bring a point close. || ||5B30.35 ||Van de Graaff and wand || ||With paper streamers as a field indicator, bring a ball and point close to the Van de Graaff. || ||5B30.40 ||electric wind || ||A point attached to a Wimshurst blows a candle flame. || ||5B30.40 ||electric wind || ||A candle between pointed and plane electrodes attached to a Wimshurst will blow the flame. || ||5B30.40 ||electric wind || ||A candle flame held near a point connected to the positive side of an electrostatic generator will repel the flame as if there is a breeze of ions. || ||5B30.40 ||point and candle || ||Attach a sharp point to one terminal of a Toepler-Holtz generator and point it at a candle flame. || ||5B30.41 ||history of the electric wind || ||Covers discovery and early investigations, the dust controversy, and recent studies and applications. || ||5B30.42 ||corona discharge in air || ||The corona discharge from a point towards a candle flame and a pinwheel spinning. || ||5B30.43 ||cooling with electric wind || ||The electric wind from needle points cools a glowing nichrome wire heater. || ||5B30.44 ||corona current || ||A 1/2 Meg resistor in series with a galvanometer measure the current in a corona discharge from an electrostatic machine. || ||5B30.45 ||corona discharge || ||A charged aluminum rod with a needle at one end will charge a nearby sphere with like charge if the needle is pointed to the sphere and with opposite charge if the needle is pointed away. || ||5B30.45 ||escape of charge from a point || ||When charge is induced on an electrode with a point, the induced charge will escape and the charge on the induced electrode will be the same as on the inducing electrode. || ||5B30.45 ||charge by pointing || ||Charge a conductor by proximity to a point attached to a static machine. || ||5B30.46 ||discharging from a point || ||Three balloons filled with illuminating gas are suspended from a point and charged. The blunt end of a brass rod has little effect but the pointed end discharges the balloons when pointed at them. || ||5B30.46 ||darning needle discharge || ||The blunt end of a darning needle is placed on the charged conductor of an electroscope and the electroscope is discharged. || ||5B30.47 ||collapse the field || ||The point of a grounded needle is brought near a charged tinsel tassel and the tassel collapses. || ||5B30.48 ||electrical discharge from water drop || ||A drop of water placed on the positive electrode of a Wimshurst will form a corona but spit droplets when placed on the negative electrode. || ||5B30.49 ||point cathode effect || ||A point 1s biased to 1200 V in a Wilson cloud chamber. || ||5B30.50 ||pinwheel || ||A pinwheel spins when attached to a Wimshurst generator. || ||5B30.50 ||electrostatic pinwheel || ||A conducting pinwheel spins when connected to a Wimshurst. || ||5B30.50 ||pinwheel || ||A pinwheel rotates when connected to either terminal of a static machine. || ||5B30.50 ||pin wheel || ||Place a pinwheel on a Van de Graaff generator. || ||5B30.51 ||electrostatic solar system || ||A double pinwheel rotates when connected to a Wimshurst. || ||5B30.60 ||electrostatic precipitator || ||Clear smoke in a chimney with points are connected to a Wimshurst. || ||5B30.60 ||Cottrell precipitator || ||Clear a smoke filled tube by a discharge from wire points. || ||5B30.60 ||smoke precipitation || ||Demonstrate smoke particles precipitating in a strong electric field in an artificial chimney. || ||5B30.60 ||smoke precipitation || ||Attach a Wimshurst to terminals at each end of a glass tube filled with smoke. || ||5B30.90 ||energy in the discharge || ||Light some alcohol or a Bunsen burner with the spark from a static machine. || ||5B30.91 ||gas explosion by spark || ||A spark plug hooked to a static machine is used to explode a mixture of hydrogen and oxygen in a closed container. || ||5B30.95 ||human chain || ||All students hold hands with one student holding one knob of a static machine and the other holding a metal rod near the other knob. || ||5B30.96 ||discharge through body || ||A student standing on the floor touches other students standing on insulated stands holding on to the two knobs of a static machine. || * 5B30.00 [[ElectrostaticRollerBall|Electrostatic Roller Ball]] * 5B30.20 [[CavendishSpheres|Cavendish Spheres]] * 5B30.22 [[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]] [[Instructional|Home]]