The lines of force due to the Earth's horizontal component of the magnetic field are:

Give information about Earth's magnetism.

Magnetic meridian is a

$A$ compass needle will show which one of the following directions at the Earth's magnetic pole?

The magnetic field due to the Earth is closely equivalent to that due to:

$A$ magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $22^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the place is known to be $0.35 \; G$. Determine the magnitude of the earth's magnetic field (in $G$) at the place.