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What is an equipotential surface ? Show that the electric field at a point on the surface of a charged conductor or just outside it is perpendicular to the surface ? |
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Answer» Solution :n equipotential surface is that, electric POTENTIAL at every point of which is the same. By definition potential difference between two POINTS = work done in carrying unit + ve test charge from one point to another. As for an equipotential surface potential difference is zero hence no work is to be done in moving a test charge from one point to another of an equipotential surface. Thus, `dW = vecE. VEC(dr) = E drcos theta = 0" and it leads to " cos thetaor theta = 90^@` Thus, electric field intensity `vecE` on the surface of a conductor is always PERPENDICULAR to the surface. |
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