At the magnetic poles of the earth,a compass needle will be

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

$A$ compass needle is free to rotate in a horizontal plane. Its magnetic moment is $60 \ Am^2$. When it is pointing geographical north,it experiences a torque of $1.2 \times 10^{-3} \ Nm$ due to the Earth's magnetic field. If the Earth's magnetic field in the horizontal direction is $40 \times 10^{-6} \ T$,what is the declination in degrees at that place?

What are the Earth's magnetic elements? Define them and list them.

The angle of dip at the magnetic equator is....$^o$

If the dip circle is set at $45^{\circ}$ to the magnetic meridian,then the apparent dip is $30^{\circ}$. The true dip of the place is: