The square loop $ABCD$, carrying a current $i$, is placed in uniform magnetic field $B$, as shown. The loop can rotate about the axis $XX$'. The plane of the loop makes and angle $\theta$  ($\theta$  $< 90^o$) with the direction of $B$. Through what angle will the loop rotate by itself before the torque on it becomes zero
  • A$\theta$ 
  • B$90^o$ - $\theta$ 
  • C$90^o$ + $\theta$ 
  • D$180^o$ - $\theta$ 
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