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

$A$ 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.

The value of horizontal component of earth's magnetic field at a place is $0.35 \times 10^{-4} \,T$. If the angle of dip is $60^{\circ}$,the value of vertical component of earth's magnetic field is nearly ............. $\times 10^{-4} \,T$.

Which of the following relations is correct in the context of Earth's magnetism?

The relation between $Z_E, H_E$,and $B_E$ is . . . . . . .

Which of the following statements proves that Earth has a magnetic field?