Physics Question from JEE Main 2023 · 25 January, Shift 2

For a moving coil galvanometer, the deflection in the coil is $0.05 \, \text{rad}$ when a current of $10 \, \text{mA}$ is passed through it. If the torsional constant of the suspension wire is $4.0 \times 10^{-5} \, \text{N m/rad}$, the magnetic field is $0.01 \, \text{T}$, and the number of turns in the coil is $200$, the area of each turn (in cm$^2$) is: