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

    $\cos e{c^{ - 1}}\,\left( {\frac{H}{{{H_0}}}} \right)$

  • D

    ${\cot ^{ - 1}}\,\left( {\frac{{{H_0}}}{H}} \right)$

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