Which of the following relation is correct in magnetism
${I^2} = {V^2} + {H^2}$
$I = V + H$
$V = {I^2} + {H^2}$
${V^2} = I + H$
The vertical component of the earth's magnetic field is $6 \times 10^{-5} T$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be $\left(\right.$ Given $\left.\tan 37^{\circ}=\frac{3}{4}\right)$
The lines joining the places of the same horizontal intensity are known as
The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing
The magnetic field of earth is due to
The angle of dip at a certain place is $30^o$. If the horizontal component of the earth’s magnetic field is $H, $ the intensity of the total magnetic field is