Magnetic Moment

Q. An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

1. M
2. $\frac{2M}{\pi }$
3. $\frac{M}{\pi }$
4. $M\pi$

Q. 16.A bar magnet is oscillating in the earths magnetic field with a period T.what happens to its period and motion if its mass is quadrupled

Q. The microscopic roots of magnetism in iron and other materials can be traced back to

1. Orbital magnetic moment
2. Spin magnetic moment
3. Rotational magnetic moment
4. All of these

Q. The figure shows two diamagnetic spheres locate near the South Pole of a bar magnet. Then