Magnetisation and Magnetic Intensity

Soft iron is used in many parts of electrical machines for

Define terms magnetic permeability and magnetic susceptibility. Derive relation between relative permeability and susceptibility.

What do you mean by hysteresis? Explain it. Draw hysteresis loop and show remanence and coercivity in hysteresis loop.

A solenoid of $500$  turns per meter is carrying current of $3 \mathrm{A}.$ Its core is made of iron, which has a relative permeability of $5000.$ Determine the magnitude of magnetic intensity, intensity of magnetisation and magnetic field inside the core.

A magnetising field of $1500 \mathrm{A} {\mathrm{m}}^{-1}$ produces a magnetic flux density $0.48 \mathrm{Wb} {\mathrm{m}}^{-2}$ in an iron bar. Calculate magnetic permeability and susceptibility of iron bar used.

A magnetising field of $1600 \mathrm{A}{ \mathrm{m}}^{-1}$ produces a magnetic flux of $4.8\times {10}^{-5} \mathrm{Wb}$ in an iron bar of cross-sectional area $0.4{ \mathrm{cm}}^2.$ Calculate its Magnetic permeability

What is the main use of hysteresis curve?

What is SI unit of magnetic permeability and magnetic susceptibility?

Relative permeability is related with magnetic susceptibility ${\chi }_m$ as ${\mu }_r=$ _____ .

A bar magnet made of steel has a magnetic moment of $1.5 \mathrm{A}{ \mathrm{m}}^2$ and a mass $6\times {10}^{-3} \mathrm{kg}.$ If the density of steel is $8\times {10}^3 \mathrm{kg} {\mathrm{m}}^{-3}$ then the intensity of magnetisation of the magnet is

The ratio of external magnetic field to the permeability of free space is called

A paramagnetic sample shows net magnetisation of $18 \mathrm{A}{ \mathrm{m}}^{-1}$ when placed in an external magnetic field of $0.9 \mathrm{T}$ at a temperature of $36 \mathrm{K}.$ When the same sample is placed in an external magnetic field of $0.3 \mathrm{T}$ at a temperature of $54 \mathrm{K},$ the magnetisation will be

Relative permeability of superconductors is

The magnetic induction and magnetising field intensity in a sample of magnetic material are $B$ and $H$ respectively. The magnetic susceptibility of the material is

Define the terms magnetic susceptibility and magnetic permeability. Derive the relation between relative magnetic permeability and magnetic susceptibility.

Define the terms the intensity of magnetization.

Name the material which has negative magnetic susceptibility.

Define the terms retentivity and coercivity.

Distinguish between diamagnetic and ferromagnetic substances in respect of (i) intensity of magnetisation, (ii) behaviour in a non-uniform magnetic field and (iii) susceptibility.

How does the magnetic permeability ${\mu }_r$ differ for dia, para and ferromagnetic materials?