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Can electric field exist longitudinal to...

Can electric field exist longitudinal to an equipotential surface ? Give reason .

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Electric field cannot exist longitudinal to an equipotential surface . Along an equipotential surface , electric potential V = a constant , and hence `E = - (dV)/(dt) = 0` .
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Assertion(A): Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential Reason(R): Negative gradient of electric potential is electric field.