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(D) When a charge $q$ is placed inside the cavity of a conductor,it induces a charge $-q$ on the inner surface of the cavity and a charge $+q$ on the

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electric field at $S$ will not change

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(D) When a charge $q$ is placed inside the cavity of a conductor,it induces a charge $-q$ on the inner surface of the cavity and a charge $+q$ on the outer surface of the conductor.Since the conductor is uncharged,the total charge on the outer surface remains $+q$.This induced charge $+q$ on the outer surface distributes itself uniformly if the conductor is spherical,regardless of the position of the charge $q$ inside the cavity.The electric field at any point $S$ outside the conductor is due to this total induced charge $+q$ on the outer surface.Since the distribution of the charge $+q$ on the outer surface does not change when the internal charge $q$ is moved within the cavity,the electric field at point $S$ remains unchanged.

$A$ charge $q$ is placed at $O$ in the cavity of a spherical uncharged conductor. Point $S$ is outside the conductor. If the charge is displaced from $O$ towards $S$ while still remaining within the cavity,then:

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