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 between the two cylinders when a uniform line charge is kept along the axis of the cylinders
• D. No potential difference appears between the two cylinders when same charge density is given to both the cylinders

Answer 1

Answer: (A)

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

Answer 2

There will be appear potential difference between two cylinders if electric field is present in the space between them.

Q E = – $\frac { \mathrm { dV } } { \mathrm { dr } }$ and E = $\frac { 2 \mathrm { k } \lambda } { \mathrm { r } }$