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A cube of a metal is given a positive charge Q. For the above system, which of the following statements is true

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Electric potential within the cube is zero

Electric field is normal to the surface of the cube

Electric potential at the surface of the cube is zero

Electric field varies within the cube

answer is C.

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Detailed Solution

As the cube is conducting the whole surface of cube will be of same potential. As the direction of electric field lines will always be perpendicular to the equipotential surface, electric field is normal to the surface of the cube.

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