Question

A rectangular coil 6 cm long and 2 cm wide is placed in a magnetic field of 0.02 T. If the loop contains 200 turns and carries a current of 50 mA, the torque on the coil when its area vector is perpendicular to the field will be?

• A. $2.4\times {10}^{-4}Nm$
• B. 2.4 Nm
• C. 0.24 Nm
• D. 0.024 Nm

Answer 1

The correct option is A $2.4\times {10}^{-4}Nm$

T = BiAn
=$0.02\times 50\times {10}^{-3}\times 12\times {10}^{-4}\times 200=24\times {10}^{-5}=2.4\times {10}^{-4}Nm$