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Question

The field line and equipotential surfaces are :

A
perpendicular
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B
parallel
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C
inclined at any angle
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D
none of the above
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Solution

The correct option is A perpendicular
An equipotential surface means, a surface on which the electric potential is constant. The field lines have to be perpendicular. Otherwise there will be lines of force parallel to the surface and charges will start moving on the surface. This happens only if there is difference in potential.

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