Should you use metallic or plastic-coated magnets for the electrodes? Why? b)What would happen to the charges on the surface of a conductor if the electric field was not perpendicular to the surface? c) Why must you "clean" (i.e. polish) the conductors? d) Why are electric field lines always perpendicular to equipotential lines?

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a plastic coated magnets are used as magnetic field can pass through pl... View the full answer