MagnetismHard
Question
The square loop ABCD, carrying a current I, is placed in a uniform magnetic field B, as shown. The loop can rotate about the axis XX′. The plane of the loop makes an angle θ (θ < 90o) with the direction of B. Through what angle will the loop rotate by itself before the torque on it becomes zero -
Options
A.θ
B.90o - θ
C.90o + θ
D.180o + θ
and 
is 
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