Question

The induced emf produced due to a varying magnetic flux is V. A charge q is taken around a loop. Then work done is

• A. zero
• B. qV
• C. $\frac{qV}{2}$
• D. none

Answer 1

Answer: (B)

qV

The electric field produced due to varying magnetic flux forms loop.
Hence when a charge $q$ is taken around a loop, the work done is due to transport of charge across whole path of electric field with induced emf equal to $V$.

Hence, the work done $=qV$.