A moving coil galvanometer has a coil of effective area A and number of turns N. The magnetic field B is radial. If a current I is passed through the coil, the torque acting on the coil is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $NABI$
The torque on a moving coil galvanometer is given by:
$\tau = N \cdot I \cdot A \cdot B$
Where:
- $N$ = number of turns
- $I$ = current through the coil
- $A$ = area of the coil
- $B$ = magnetic field (radial)
∴ Torque acting on the coil = N I A B