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(A) When a positive charge $q$ is placed inside the cavity of a neutral conducting shell,it induces a charge of $-q$ on the inner surface of the shell

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(A) When a positive charge $q$ is placed inside the cavity of a neutral conducting shell,it induces a charge of $-q$ on the inner surface of the shell to ensure that the electric field inside the conducting material is zero. Since the shell is neutral,a charge of $+q$ must appear on the outer surface of the shell. The charge distribution will be uniform on both the inner and outer surfaces,except near the gap. The electric field inside the material of the conductor must be zero,which is satisfied by this distribution. The correct representation is shown in the figure,where the inner surface has a negative charge and the outer surface has a positive charge.

$A$ positive charge $q$ is placed at the centre of a neutral hollow cylindrical conducting shell with its cross-section as shown in the figure below. Which one of the following figures correctly indicates the induced charge distribution on the conductor? (Ignore edge effects)

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