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.

A magnetic needle placed in uniform magnetic field has magnetic moment of 2xx10^-2 Am^2 , and moment of inertia of 7.2xx10^7 kgm^2 . It performs 10 complete oscillations in 6s. What is the magnitude of the magnetic field?

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?

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 magnetic dipoles has magnetic moment 0.5 Am^2 . Calculate its magnetic field at a distance of 20cm from the center of magnetic dipole on the axis.

A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. If the magnet is rotated by 90^(@) in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth's magnetic field =B_(H))

A bar magnet has a magnetic moment equal to 5 xx 10^-5 W-m .It is suspended in a magnetic field, which has a magnetic induction equal to 8pi xx 10^-4 tesla . The magnet vibrates with a time period of vibration equal to 15 s.The moment of inertia of the bar magnet is