Two bar magnets having their moment of inertia in the ratio `1: 1.5` oscillate in a horizontal plane with time periods 2.5s and 4.5s respectively. Compare their magnetic moments.

A bar magnet of moment of inertia of 500 gcm^2 makes 10 oscillations per minute in a horizontal plane. What is its magnetic moment, if the horizontal component of earth's magnetic field is 0.36 gauss?

A bar magnet having a magnetic moment of 2 xx l0 ^4 JT^-1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 xx 10^-4 T exits in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60^@ from the field is:

Two wires have lengths in the ratio 1:4 and radii in the ratio 1: 2 . The resistivities of the materials of the wires are in the ratio 5: 1 . Compare their resistances.

Two pendulums start oscillating in the same direction at the same time. Their time periods are 2 s and 1.5 s respectively , then the phase difference between them when the smaller pendulum has completed one vibration , will be

Two magnets with the same dimensions and mass, but of magnetic moments mu_1 =100Am^2 and mu_2= 50 Am^2 are jointly suspended in the earth's magneticfield. So as to perform angular oscillations in a horizontal plane.When their like poles are joinedtogether the period of their angular S.H.M is 5s. Find the period of angular S.H.M, when theirunlike poles are joined together.

. A short bar magnet has a magnetic moment of 2A -m^2 . If its magnetic length is 5cm, calculate its pole strength?

A bar magnet of mass 120 g, in the form of a rectangular parallelopiped has dimensions l = 40 mm, b = 10 mm and h = 80 mm. With the dimensions h vertical, the magnet performs angular oscillations, in the plane of a magnetic field with period pis . If its magnetic moment is 3.4Am^2 , determine the influencing magnetic field.