$A$ line passing through places having zero value of magnetic dip is called

If the angles of dip at two places are $30^{\circ}$ and $45^{\circ}$ respectively,then the ratio of horizontal components of earth's magnetic field at the two places will be

$A$ dip circle is at a right angle to the magnetic meridian. What will be the apparent dip in degrees?

At a point $A$ on the earth's surface, the angle of dip is $\delta = +25^{\circ}$. At a point $B$ on the earth's surface, the angle of dip is $\delta = -25^{\circ}$. We can interpret that:

The vertical component of the Earth's magnetic field is zero at:

Give the location of magnetic:
$(i)$ north pole
$(ii)$ south pole