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qUESTIONS

Textbook-Solutions-12th-MH

A short bar magnet is placed in an external magnetic field of 700 guass. When its axis makes an angle of 30° with the external magnetic field, it experiences a torque of 0.014 Nm. Find the magnetic moment of the magnet, and the work done in moving it from its most stable to most unstable position.

Textbook-Solutions-12th-MH

A magnetic needle placed in uniform magnetic field has magnetic moment of 2 × 10-2 A m2 , and moment of inertia of 7.2 × 10-7 kg m2 . It performs 10 complete oscillations in 6 s. What is the magnitude of the magnetic field ?

Textbook-Solutions-12th-MH

A paramagnetic gas has 2.0 × 10^26 atoms/m with atomic magnetic dipole moment of 1.5 × 10^-23 A m2 each. The gas is at 27° C. (a) Find the maximum magnetization intensity of this sample. (b) If the gas in this problem is kept in a uniform magnetic field of 3 T, is it possible to achieve saturation magnetization? Why?(kB = 1.38 × 10^-23 JK-1)

Textbook-Solutions-12th-MH

An electron in an atom is revolving round the nucleus in a circular orbit of radius 5.3 × 10-11 m, with a speed of 2 × 106 ms-1 Find the resultant orbital magnetic moment and angular momentum of electron. (charge on electron e = 1.6 × 10-19 C, mass of electron me = 9.1 × 10-31 kg.)

Textbook-Solutions-12th-MH

The work done for rotating a magnet with magnetic dipole momentm, through 90° from its magnetic meridian is n times the work done to rotate it through 60°. Find the value of n.

Textbook-Solutions-12th-MH

A rod of magnetic material of cross section 0.25 cm2 is located in 4000 Am-1 magnetising field. Magnetic flux passing through the rod is 25 × 10-6 Wb. Find out (a) relative permeability (b) magnetic susceptibility and (c) magnetisation of the rod.

Textbook-Solutions-12th-MH

When a plate of magnetic material of size 10 cm × 0.5 cm × 0.2 cm (length , breadth and thickness respectively) is located in magnetising field of 0.5 × 104 Am-1 then a magnetic moment of 0.5 Am2 is induced in it. Find out magnetic induction in plate.

Textbook-Solutions-12th-MH

A domain in ferromagnetic iron is in the form of a cube of side length 1 μ m . Estimate the number of iron atoms in the domain and the maximum possible dipole moment and magnetisation of the domain. The molecular mass of iron 55g/mole and is density is 7.9 g / c m 3 7.9 𝑔 / 𝑐 𝑚 3 . Assume that each iron atom has a dipole moment of 9.27 × 10^−24 A m 2 9.27 × 10^-24 𝐴 𝑚 2 .

Textbook-Solutions-12th-MH

The region inside a current carrying toroid winding is filled with Aluminium having susceptibility χ=2.3×10^−5. What is the percentage increase in the magnetic field in the presence of Aluminium over that without it?

Textbook-Solutions-12th-MH

Calculate the gyromagnetic ratio of electron.

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