A 250-Turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 microA and subjected to a magnetic field of strength 0.85 T.Work done for rotating the coil by 180° against the torque is
A 250-Turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 microA and subjected to a magnetic field of strength 0.85 T.Work done for rotating the coil by 180° against the torque is

(1) 4.55 micro Joule

(2) 2.3 micro Joule

(3) 1.15 micro Joule

(4) 9.1 micro Joule

Solution : Answer (4)