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 $\theta =$
${\tan ^{ - 1}}\,\left( {\frac{{{H_0}}}{H}} \right)$
${\tan ^{ - 1}}\,\left( {\frac{H}{{{H_0}}}} \right)$
$\cos e{c^{ - 1}}\,\left( {\frac{H}{{{H_0}}}} \right)$
${\cot ^{ - 1}}\,\left( {\frac{{{H_0}}}{H}} \right)$
The angle of dip at a place is $40.6°$ and the intensity of the vertical component of the earth's magnetic field $V = 6 \times {10^{ - 5}}$ $Tesla$. The total intensity of the earth's magnetic field $ (I) $ at this place is
The north pole of the earth's magnet is near the geographical
A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake
At a certain place, the horizontal component ${B_0}$ and the vertical component ${V_0}$ of the earth's magnetic field are equal in magnitude. The total intensity at the place will be
At a certain place the horizontal component of the earth’s magnetic field is $B_0$ and the angle of dip is $45^o$. The total intensity of the field at that place will be