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 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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