A magnet of total magnetic moment 10-2î A - m2 is placed in a time varying magnetic field, B î(cos ωt) , where B = 1 Tesla and ω = 0.125 rad/s. The work done for reversing the direction of the magnetic moment at t = 1 second, is :
(1) 0.007 J
(2) 0.014 J
(3) 0.028 J
(4) 0.02 J
