ELECTRICITY AND MAGNETISM - ELECTRIC FIELDS AND POTENTIAL - ELECTRIC FIELD NC State University Faculty Access

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Electric Field Lines
# 5B10.40




Description: View electric field lines between charged electrodes. 5 electrode plates with different charge configurations are available.

Instructions:
1. Place the plastic plate holder (the one with the red and black terminals) on the overhead projector, and insert an electrode plate into the holder. The metal electrodes should be on top.
2. Use the air bubble in the observation plate (the one filled with green particles and liquid) to spread the green particles around evenly, and then place the observation plate on top of the electrode plate. Make sure the air bubble is in the small chamber so that it is out of the way.
3. Charge the terminals with the piezoelectric "gun" by connecting the blue plug of the gun into the black terminal on the plate holder and putting the needle of the gun into the red terminal. Pull the trigger repeatedly until field lines appear.

Purchased/Built: purchased

Setup Time: 5 minutes

Quant. in Demo Room: 1

Demo References
The Video Encyclopedia of Physics Demonstrations Disc 17-10 A pan on the overhead projector contains particles in a liquid that align with the electric field.
Meiners 29-2.1 Bits of material suspended in oil align with an applied electric field. Several pole arrangements are shown.
Freier and Anderson Eb-1 Charged electrodes are placed in a tank of mineral oil containing velveteen and the pattern is projected on the overhead.
The American Journal of Physics AJP 32(5),388 Fine black fiber clippings in castor oil are used to show electric field between electrodes.

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