Question

A magnetic pole of strength $4Am$ is move twice around a long straight wire carrying a current of $3A$. The work done is:

• A. $96\pi \times {10}^{-7}J$
• B. $48\times {10}^{-7}J$
• C. $108\times {10}^{-7}J$
• D. zero

Answer 1

The correct option is D zero

A per Gauss's law in magnetic mono pole do not exist$.$

but if we consider the hypothetical case then$,$ work done will be zero$,$ this is because current carrying conductor also generates magnetic field in circular loop around the wire$.$

Hence,

option $\left(D\right)$ is correct answer.