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  4. A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is

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Q. A moving coil galvanometer has $N$ number of turns in a coil of effective area $A$, it carries a current $I$. The magnetic field $B$ is radial. The torque acting on the coil is

Moving Charges and Magnetism

Solution:

$\tau=M B \sin \theta \Rightarrow \tau_{\max }=N i A B, \quad\left[\theta=90^{\circ}\right]$