A long, hollow conducting cylinder is kept coaxially inisde another long, hollow conducting cylinder of larger radius. Both the cylinders are initially electrically neutral.

Options

A. (a) A potential difference appears between the two cylinders when a charge denisty is given to the inner cylinder.
B. (b) A potential difference appears between the two cylinders when a charge denisty is given to the outer cylinder.
C. (c) No potential difference appears between the two cylinders when a uniform line charge is kept along the axis of the cylinders
D. (d) No potential difference appears between the two cylinders when same charge denisty is given to both the cylinders.

Answer

A

Explanation

When a charge denisty is given to the inner cylinder, the potential developed at its surface is different from that on the outer cylinder. This is because the potential decreases with distance for a charged conducting cylinder when the point of conisderation is outisde the cylinder.
But when a charge denisty is given to the outer cylinder, it will change its potential by the same amount as that of the inner cylinder. Therefore no potential difference will be produced between the cylinders in this case.