$A$ current-carrying coil is placed with its axis perpendicular to the $N-S$ direction. Let the horizontal component of the earth's magnetic field be $H_0$ and the magnetic field inside the loop be $H$. If a magnet is suspended inside the loop,it makes an angle $\theta$ with $H$. Then $\theta =$

  • A
    $\tan^{-1}\left(\frac{H_0}{H}\right)$
  • B
    $\tan^{-1}\left(\frac{H}{H_0}\right)$
  • C
    $\csc^{-1}\left(\frac{H}{H_0}\right)$
  • D
    $\cot^{-1}\left(\frac{H_0}{H}\right)$

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