Your younger brother likes to rub his feet on the carpet and then touch you to give you a shock. While you are trying to escape the shock treatment, you discover a hollow metal cylinder in your basement, large enough to climb inside. In which of the following cases will you not be shocked? You climb inside the cylinder, making contact with the inner surface, and your charged brother touches the outer metal surface. Both of you are outside the cylinder, touching its outer metal surface but not touching each other directly. Your charged brother is inside touching the inner metal surface and you are outside, touching the outer metal surface.

Since all of the charges are stored on the outer layer, shock will not be felt on the inner surface. We enter the cylinder and make contact with the interior surface, while your charged brother comes into contact with the outer metal surface.

When your brother touches the outside side, the whole charge spreads on the outside surface due to the conductivity. As a result, you will not experience any shock.

A shockwave would be felt because the provided charge would be uniformly distributed on the outer surface.
A shockwave would be felt because the charge from the inner surface will transfer to the outermost layer.

Therefore the answer is "choice a".

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