PHYS
S13Phys2BaLec25A

# D the net work done by electric forces that move a

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D) The net work done by electric forces that move a charge along an equipotential surface is equal to zero Joules.

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Parallel Plates If we had a very large plane of positive charge, what would the electric field look like? The electric field would be uniform in both directions away from the positive plate. + + + + + + + + A positive charge on either side of the plate (top or bottom) would be repelled.
Parallel Plates What would be different if the plate were negative (but had the same magnitude of charge)? The electric field would flip direction (in toward the negative plate), but still have the same magnitude. – – – – A positive charge on either side of the plate (top or bottom) would be attracted.

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Parallel Plates What would now happen if I place the plates close together and parallel to each other? The field would be twice as strong in between the plates, but would essentially disappear outside of the plates. + + + + + + + + – – – – What would the equipotential lines look like between the plates? Equipotential lines are evenly spaced!
We have created a device to use electric fields. We call this device a capacitor. We put opposite charges on two parallel plates and we create an electric field in between the plates. This is essentially storing energy between these plates. What limits how much energy/charge I can put on these plates? The geometry of the plates. Capacitors

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Capacitance What is capacitance?
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• Spring '08
• schuller
• Physics, Electric charge, Capacitor Construction

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