A current carryingcoil 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 is H. If a magnet is suspended inside the loop, it makes angle `theta` with H. Then `theta`=

Options

A. `tan^(-1)(H_(0)/H)`
B. `tan^(-1)(H/H_(0))`
C. `cosec^(-1)(H/H_(0))`
D. `cot^(-1)(H_(0)/H)`

Answer

A

Explanation

In given case `H` and `H_(0)` are perpendicular to each other.

From figure `tan theta=H_(0)/H`
`implies theta=tan^(-1)(H_(0)/H)`