[" 70Magnetism and Matter "],[" A "250" -Turn rectangular coil of length "2.1cm" and "],[" width "1.25cm" carries a current of "85 mu A" and "],[" subjected to a magnetic field of strength "0.85T" ."],[" Work done for rotating the coil by "180^(@)" against the "],[" torque is "],[[" (1) "9.1 mu J," (2) "4.55 mu],[" (3) "2.3 mu J," (4) "1.15 mu J]]