Magnetic Materials

The ratio of magnetisation $I$ to the magnetic field intensity $H$ is

The relative permeability $\left( \mu_{r} \right)$ of a substance is related to its susceptibility ( $\chi$ ) as

Susceptibility of a paramagnetic substance is

The materials having negative magnetic susceptibility are

Susceptibility of ferromagnetic substance is

An example of a diamagnetic substance is

A diamagnetic liquid is filled in a U-tube. One arm of a 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

In the following graph of flux density versus magnetizing force, coercivity and retentivity are respectively represented by the points

The self inductance of an air-core inductor (solenoid) is 0.03 mH . By introducing an iron core into inductor the self-inductance increases to 30 mH . The relative permeability of the core used is

The product of magnetic susceptibility $(\chi)$ and absolute temperature $(\mathrm{T})$ is constant for a

Magnetic hysteresis is exhibited by magnetic materials which are

The given figure represents a material which is

Electromagnets are made of soft iron because soft iron has

Which of the following figure best represents the variation of magnetic susceptibility $(\chi)$ with temperature for a diamagnetic substance?

The region inside a current carrying toroid is filled with a material (Niobium) having susceptibility $\chi=2.6 \times 10^{-5}$. The percentage increase in the magnetic field in the presence of Niobium over that without it, is