Magnetism And Matter - Electromagnetism - Physics Previous Year Questions

The magnetization of bar magnet of length 5 cm , cross sectional area $2 \mathrm{~cm}^2$ and net magnetic moment $1 \mathrm{Am}^2$ is

Magnetic susceptibility of a paramagnetic substance is

A magnetizing field of $5000 \mathrm{~A} / \mathrm{m}$ produces a magnetic flux of $4 \times 10^{-5} \mathrm{~Wb}$ in an iron rod of cross-sectional area $0.4 \mathrm{~cm}^2$. The permeabilit of the rod in Wb/A-m, is

The magnetic susceptibility of a paramagnetic material at \(-73^{\circ} \mathrm{C}\) is 0.0075. Its value at \(-173^{\circ} \mathrm{C}\) will be

A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length

If the angle of dip at places \(A\) and \(B\) are \(30^{\circ}\) and \(45^{\circ}\) respectively, then the ratio of horizontal component of earth's magnetic field at \(A\) to that at \(B\) will be \(\left[\sin 45^{\circ}=\cos 45^{\circ}=\frac{1}{\sqrt{2}}, \sin \frac{\pi}{6}=\frac{1}{2}, \cos \frac{\pi}{6}=\frac{\sqrt{3}}{2}\right]\)

An iron rod is placed parallel to magnetic field of intensity \(2000 \mathrm{~A} / \mathrm{m}\). The magnetic flux through the rod is \(6 \times 10^{-4} \mathrm{~Wb}\) and its cross-sectional area is \(3 \mathrm{~cm}^2\). The magnetic permeability of the rod in \(\frac{\mathrm{Wb}}{\mathrm{A}-\mathrm{m}}\) is

Two identical bar magnets each of magnetic moment \(M\), separated by some distance are kept perpendicular to each other. The magnetic induction at a point at the same distance \(d\) from the centre of magnets, is (\(\mu_0=\) permeability of free space)

A steel wire of length / has a magnetic moment $M$. It is then bent into a semicircular arc. The new magnetic moment is

For a paramagnetic substance, the magnetic susceptibility is

A domain in a ferromagnetic substance is in the form of a cube of side $1 \mu \mathrm{~m}$. If it contains $8 \times 10^{10}$ atoms and each atomic dipole has a dipole moment of $9 \times 10^{-24} \mathrm{Am}^2$, then the magnetisation of the domain is

The north pole of a long horizontal bar magnet is being brought towards closed circuit consisting of a coil. The direction of induced current produced in it is

What is susceptibility of a medium, if its relative permeability is 0.85?

The relative permeability of iron is 2000. Its absolute permeability in SI unit will be \(\left(\frac{\mu_0}{4 \pi}=10^{-7} \text{SI unit}\right)\)

The permeability of a metal is \(0.1256 ~\mathrm{TmA}^{-1}\). Its relative permeability will be \(\mathrm{\left( {{{{\mu _0}} \over {4\pi }} = {{10}^{ - 7}}\,SI\,unit} \right)}\) (\(\pi=3.14\))

Two bar magnets '\(\mathrm{P}\)' and '\(\mathrm{Q}\)' are kept in uniform magnetic field '\(\mathrm{B}\)' with magnetic moments '\(\mathrm{M_P}\)' and '\(\mathrm{M_Q}\)' respectively. Magnet 'P' is oscillating with frequency twice that of magnet 'Q'. If the moment of inertia of the magnet 'P' is twice that of magnet 'Q' then

A magnetic dipole of magnetic moment \(\mathrm{M}\), is freely suspended in a magnetic field of induction B. The minimum and maximum values of potential energy of the dipole, respectively are

A current '\(I\)' is flowing in a conductor of length '\(L\)' when it is bent in the form of a circular loop, its magnetic moment will be

The magnetic susceptibility of the material of a rod is 349 and permeability of vacuum \(\mu_0\) is \(4 \pi \times 10^{-7}\) SI units. Absolute permeability of the material of the rod in SI units is

A solenoid of 500 turns/m is carrying a current of 3 A. Its core is made of iron which has relative permeability 5001. The magnitude of magnetization is