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There is a cubical cavity inside a conducting sphere of radius R. A positive point charge Q is placed at the centre of the cube and another positive charge q is placed at a distance `1(gtR)` from the centre of the sphere. The sphere is earthed Net charge on the outer surface of conducting sphere isA. `+Q`B. `Q-qR//1`C. `-qR//I`D. none |
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Answer» Correct Answer - C Potential of the sphere is zero as it is earthed so potehtial at the centre, v=0 `Rightarrowv=(Kq)/l+(QE)/R=0` `Q^(1)`=charge induced on the surface of the sphere `Rightarrow Q^(1)=(-qR)/l` |
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