College physics question about magnetic moment. please help?

Question

A small compass needle oscillates with a period of 2.5 seconds when placed at a point where the horizontal component of the earth's magnetic field is 0.2 gauss. Determine the magnetic moment of the compass needle if its moment of inertia about the axis of rotation is 24 g-cm^2

Answer 1

At the college level, they call what you are attempting to do "plagiarism."

Answer 2

How am I supposed to know? I'm 13.