Which of the following relation is correct in magnetism
${I^2} = {V^2} + {H^2}$
$I = V + H$
$V = {I^2} + {H^2}$
${V^2} = I + H$
If the dip circle is set at $45^o$ to the magnetic meridian, then the apparent dip is $30^o$. The true dip. of the place is
At which place, earth's magnetism become horizontal
The magnetic compass is not useful for navigation near the magnetic poles because
A dip circle lies initially in the magnetic meridian, it shows an angle of dip $\delta$ at a place. The dip circle is rotated through an angle $\alpha$ in the horizontal plane and then it shows an angle of dip $\delta^{\prime}$. Hence $\frac{\tan \delta^{\prime}}{\tan \delta}$ is
Define geographic meridian. and Define magnetic meridian.