A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a steady current of $85 \mu \

Question

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a steady current of $85 \mu \mathrm{~A}$ and is subjected to a magnetic field of strength 0.85 T . The work done for rotating the coil by $180^{\circ}$ against the torque is

Professor PC Thomas Classes · Answer

Work $W = 2MB = 2(NIA)B = 9.5 	ext{ pJ}$.