Question

A conductor AB lies along the axis of a circular conducting loop C of radius $r$. If the current in the conductor AB varies at the rate of $x$ A/s, then the induced emf in the coil C is

• A. $\frac{{\mu }_{0}rx}{2}$
• B. $\frac{1}{4}\pi rx$
• C. $\frac{{\mu }_0\pi xr}{2}$
• D. zero

Answer 1

Answer: (D)

zero

The magnetic field lines are axially outwards only.
Therefore, none of them passes through the coil.

Hence induce emf generated in the coil is 0.