Question

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. $N A ^ { 2 } B ^ { 2 } I$
• B. $N A B I ^ { 2 }$
• C. $N ^ { 2 } A B I$
• D. NABI

Answer 1

Answer: (D)

NABI

Answer 2

$\tau = M B \sin \theta$ ⇒ $\tau _ { \max } = N i A B$ , ($\theta = 90 ^ { \circ }$)