Question

What is the maximum torque on a rectangular coil of area 4 cm × 80 cm of 400 turns, when carrying a current of 103 A in a magnetic field of 0.2 T?

(a) 1250 Nm

(b) 2560 Nm

(c) 3600 Nm

(d) 1985 Nm

This question was addressed to me in semester exam.

I'm obligated to ask this question of Torque on Current Loop & Magnetic Dipole topic in division Moving Charges and Magnetism of Physics – Class 12

Answer 1

Right option is (b) 2560 Nm

Explanation: Torque (Max) = NIBA.

Τmax = 400 × 10^3 × 0.2 × 320 × 10^-4

Tmax = 2560 Nm.