A current carrying coil is placed with its axis parallel to N-S direction. Let horizontal component of earth's magnetic field be H₀ and magnetic field inside the loop is H. If a magnet is suspended inside the loop, it makes angle $\mathrm{\theta }$ with H. Then $\mathrm{\theta }$ is equal to

• A

  ${\tan }^{-1}\left(\frac{{\mathrm{H}}_0}{\mathrm{H}}\right)$

• B

  ${\tan }^{-1}\left(\frac{\mathrm{H}}{{\mathrm{H}}_0}\right)$

• C

  ${\mathrm{cosec}}^{-1}\left(\frac{\mathrm{H}}{{\mathrm{H}}_0}\right)$

• D

  ${\cot }^{-1}\left(\frac{{\mathrm{H}}_0}{\mathrm{H}}\right)$