A current carrying coil is placed with its axis perpendicular to $ N-S $ direction. Let horizontal component of earth's magnetic field be $H_o$ and magnetic field inside the loop is $H$. If a magnet is suspended inside the loop, it makes angle $\theta $ with $H$. Then $\theta $$=$
${\tan ^{ - 1}}\left( {\frac{{{H_0}}}{H}} \right)$
${\tan ^{ - 1}}\left( {\frac{H}{{{H_0}}}} \right)$
$cosec^{ - 1}\left( {\frac{H}{{{H_0}}}} \right)$
${\cot ^{ - 1}}\left( {\frac{{{H_0}}}{H}} \right)$
Two short bar magnets of magnetic moments $m$ each are arranged at the opposite corners of a square of side $d$ such that their centres coincide with the corners and their axes are parallel. If the like poles are in the same direction, the magnetic induction at any of the other corners of the square is
A dip needle in a plane perpendicular to magnetic meridian will remain
Define angle of dip. and Write the definition of declination.
At a point on the surface of the earth, the value of the horizontal component of earth's magnetic field is equal to value of vertical magnetic component of earths magnetic field the angle of dip is
The vertical component of the earth's magnetic field is zero at a place where the angle of dip is.....$^o$