Question

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. a potential difference appears between the two cylinders when a charge density is given to the inner cylinder.
• B. a potential difference appears between the two cylinders when a charge density is given to the outer cylinder.
• C. no potential difference appears when a uniform line charge is kept along the axis of the cylinders.
• D. no potential difference appears when same charge density is given to both the cylinders.

Hint:

For conductors, electric field inside the material is always zero.

Answer 1

The Correct Option is A

Step 1: If charge is given to the inner cylinder, electric field exists in the region between the cylinders.
Step 2: This produces a potential difference between the two cylinders.
Step 3: Charging only the outer cylinder does not create an electric field inside it.