Name the suitable material for an electromagnet.

Which of the following is most suitable for the core of electromagnets?

What is a paramagnetic substance? If a small bar of a paramagnetic substance is placed in a non-uniform magnetic field,in which direction does it move?

The magnetic susceptibility is negative for

In a permanent magnet at room temperature,

$A$ diamagnetic liquid is filled in a $U$-tube. One arm of the $U$-tube is placed in an external magnetic field with the meniscus in line with the field. The level of the liquid in that arm will