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
A) $NA^{2}B^{2}I$
B) $NABI^{2}$
C) $N^{2}ABI$
D) $NABI$
Explanation
(d) $\tau = MB\sin\theta \Rightarrow \tau_{\max} = NiAB,\ \ \lbrack\theta = 90{^\circ}\rbrack$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.