L23_a - ELECTRIC POTENTIAL AT THE SURFACE OF AND INSIDE...

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ELECTRIC POTENTIAL AT THE SURFACE OF AND INSIDE CHARGED CONDUCTORS (text section 20.6) For a charged conductor: Any excess (net) charge MUST be at the surface There can be no component of E r parallel to the surface o Means that E r just outside a conductor must be perpendicular to the surface 0 = E r inside the conductor What does this tell us about ELECTRIC POTENTIAL for conductors? E r surface means that the surface is an equipotential 0 = E r inside says potential V inside conductor must be same as potential V at surface o entire conductor is an equipotential

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What if there is an EMPTY CAVITY in the conductor? Entire conductor is an equipotential SO everywhere on the surface of the cavity is the same potential V If cavity is empty, any electric field lines would have to start and end at points on the cavity (call these A and B) o Only way to have 0 = = B A A B s d E V V r r for ALL possible paths between A and B is if 0 = E r inside the cavity
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This note was uploaded on 03/08/2012 for the course PHYSICS 1051 taught by Professor Michaelmorrow during the Winter '12 term at Memorial University.

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L23_a - ELECTRIC POTENTIAL AT THE SURFACE OF AND INSIDE...

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