Question

A thin magnetised wire of length $10cm$ has a magnetic moment of $0.4A{m}^2$ is bent such that there is a gap of $2cm$ between its ends. Then final magnetic moment is

• A. $0.8A{m}^2$
• B. $0.02A{m}^2$
• C. $0.08A{m}^2$
• D. $0.01A{m}^2$

Answer 1

Answer: (C)

$0.08A{m}^2$

The magnetic moment is directly proportional to the straight distance between the poles of a magnetic dipole.

Hence the final magnetic moment M is given by

$0.4\times \frac{2}{10}=0.08A{m}^2$