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

A potential difference appears between the two cylinders when a charge density is given to the inner cylinder

A potential difference appears between the two cylinders when a charge density is given to the outer cylinder

No potential difference appears between the two cylinders when a uniform line charge is kept along the axis of the cylinders

No potential difference appears between the two cylinders when same charge density is given to both the cylinders