A charge q is placed at point O in a cavity in a spherical uncharged conductor. Point S is outside the conductor. If q is displaced from O towards S such that it is still inside the cavity, then electric field at S will
A
increase
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B
decrease
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C
first increase and then decrease
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D
remain unchanged
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Solution
The correct option is D remain unchanged The spherical uncharged conductor will show electrostatic shielding and will not allow electric field lines from charge q to penetrate it. Thus, there will be no effect of electric field due to q at point S. Hence, even on moving the charge inside the cavity the electric field at S will remain uncharged.