Question

A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay
(a) in horizontal direction only
(b) in vertical direction only
(c) in any direction except vertical and horizontal
(d) in the direction it is released

Answer 1

A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay in the direction it is released.

Explanation:

At the Equator Geomagnetic, The needle must try to hang itself horizontally. But here the needle is limited to be moving perpendicular to the magnetic meridian only in the vertical plane. Consequently, the needle will remain in the direction it is released.  

Equator Geomagnetic :- The hypothetical great circle on the surface of the Earth created by the intersection of a plane that Goes through the middle of the Earth perpendicular to the axis linking the magnetic poles north and south.

Thus, Option (d) is correct