The magnetic moment of a diamagnetic action is

Electromagnets are made of soft iron because soft iron has

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is