Question

Two identical coaxial circular loops carry current $i$, each circulating in the clockwise direction. If the loops are approaching each other, then

• A. Current in each loop increases
• B. Current in each loop remains the same
• C. Current in each loop decreases
• D. Current in one loop increases and in the other it decreases

Answer 1

The correct option is C Current in each loop decreases


Consider loop $1$ moving towards loop $2$.

The magnetic field and therefore, flux through loop $1$ will go on increasing so that loop $1$ will have induced emf and current in it.

The induced current will try to reduce the flux through it.

So, the induced current will be in counter-clockwise direction which result in decrease in the magnitude of current flowing through loop $1$.

Similarly, as loop $2$ is moved towards loop $1$, the magnitude of current flowing through loop $2$ will decrease due to the similar reason.

Hence, option $\left(C\right)$ is the correct answer.