Physics Question from JEE Main 2023 · 12 April, Shift 1

A conducting circular loop is placed in a uniform magnetic field of $0.4 \, \text{T}$ with its plane perpendicular to the field. Somehow, the radius of the loop starts expanding at a constant rate of $1 \, \text{mm/s}$. The magnitude of induced emf in the loop at an instant when the radius of the loop is $2 \, \text{cm}$ will be _____, $\mu V$.