A rectangular bar magnet-with sides l. b and w – h.is mass n and magnetic moment M. It is free to rotate about a vertical axis through its centre of mass such that its faces of area l × b are honzoritaL The period T of angular oscillations of this magnet in a uniform magnetic field B is given by(A) \(\cfrac1{2\pi}\)\(\sqrt{\cfrac{12MB}{m(I^2+b^2)}}\)(B) \(\sqrt{\cfrac{\pi^2m(I^2+b^2)}{3MB}}\)(C) \(\sqrt{\cfrac{m(I^2+b^2)}{3MB}}\)(D) \(\sqrt{\cfrac{\pi^2M(I^2+b^2)}{3mB}}\)

A rectangular bar magnet-with sides l. b and w – h.is mass n and mag

1.	A rectangular bar magnet-with sides l. b and w – h.is mass n and magnetic moment M. It is free to rotate about a vertical axis through its centre of mass such that its faces of area l × b are honzoritaL The period T of angular oscillations of this magnet in a uniform magnetic field B is given by(A) \(\cfrac1{2\pi}\)\(\sqrt{\cfrac{12MB}{m(I^2+b^2)}}\)(B) \(\sqrt{\cfrac{\pi^2m(I^2+b^2)}{3MB}}\)(C) \(\sqrt{\cfrac{m(I^2+b^2)}{3MB}}\)(D) \(\sqrt{\cfrac{\pi^2M(I^2+b^2)}{3mB}}\)
Answer» Correct option is (B) \(\sqrt{\cfrac{\pi^2m(I^2+b^2)}{3MB}}\)

Discussion

No Comment Found

Related InterviewSolutions

An electron in an atom revolves around the nucleus in an orbit of radius 0.5 Å. Calculate the equivalent magnetic moment if the frequency of revolution of the electron is 10 MHz.
State the expression for the torque acting on a magnetic dipole in a uniform magnetic field.
There are different types of shielding available like electrical and accoustic shielding apart from magnetic shielding discussed above. Electrical insulator functions as an electrical barrier or shield and comes in a wide array of materials. Normally the electrical wires used in our households are also shielded. In case of audio recording it is necessary to reduce other stray sound which may interfere with the sound to be recorded. So the recording studios are sound insulated using acoustic material.
Find the magnitude of the magnetic moment of a magnet if a couple exerting torque 0.5 N.m is required to hold the magnet with its axis perpendicular to a uniform magnetic field of induction 2 × 10-3T
State any four properties of a diamagnetic material.
What is diamagnetism?
Which magnetic materials have (i) relative permeability > 1 (ii) relative permeability <1?
A bar magnet of magnetic length 0.12 m and pole strength 10 A-m is placed in a uniform magnetic field of induction 3 × 10-2 tesla. If the angle between the magnetic induction and the magnetic moment is 30°, find the magnitude of the torque acting on the magnet.
What is magnetic hysteresis ? Explain it on the basis of magnetic domains.
What does the area inside the curve B – H (hysteresis curve) indicate?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment