A conducting sphere of radius r has a charge. Then

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Electric field strength inside the sphere will be equal to zero only when no external electric field exists.

The charge is uniformly distributed over its surface, if there is an external electric field.

Distribution of charge over its surface will be non uniform if no external electric field exist in space.

Potential at every point of the sphere must be same.

answer is D.

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Detailed Solution

A sphere of radius r has charge Q.

i) The charge is not uniformly distributed if there is external electric field.

ii) Electric field inside sphere is zero for any charge distribution.

iii) Potential at every point on sphere must be same otherwise charges movement takes place until potential is same.

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