A charge q is placed at O in the cavity ...

A charge q is placed at O in the cavity in a sphereical uncharged conductor. Points S is outside the conductor. If q is displaced from O towards S (still remaining within the cavity)

Electric field at S will increase

Electric field at S will decrease

Electric field at S will first increase and then decrease

Electric field at S will not change

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the figure shows a charge q placed inside a cavity in an uncharged conductor, Now if na external electric field is switched on

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