If a magnet is suspended freely such that it can rotate about its magnetic axis,in which plane does it come to rest?

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

In India,the magnetic declination at Delhi is . . . . . . .

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

The Earth's magnetic field was flipped by $180^{\circ}$ a million years ago. This flip was relatively rapid and took $10^5 \, \text{years}$. Then, the average change in orientation per year during the flip was closest to ............ $s$.

Two bar magnets with magnetic moments $2M$ and $M$ are fastened together at right angles to each other at their centres to form a crossed system,which can rotate freely about a vertical axis through the centre. The crossed system sets in the Earth's magnetic field with the magnet having magnetic moment $2M$ making an angle $\theta$ with the magnetic meridian such that: