A magnetised needle of magnetic moment `4.8xx10^(-2)JT^(-1)` ispivoted through the centre of its mass and is free to rotate in the plane of the magnetic field of the magnitude `3xx10^(-2)`T. If the needed is displaced slightly from its stable equilibrium and releaased, predict the angular frequency of its oscillations. The moment bof inertia of the needle about its axis of rotation is given to be `2.25xx10^(-5)kgm^(2)`.

A magnetic needle pivoted through it centre of mass and free to rotate in a plane containing a uniform magnetic field of 100 G is displaced slightly from its stable equilibrium . The frequency of its angular oscillations of small amplitudes is measured to be 1.5 s^(-1) . If the moment of inertia of the needle about its axis of rotation is 0.75 xx 10^(-5) kg m^(2) , determine the magnetic moment of the needle.

A magnetic needle pivoted through its centre of mass and is free to rotate in a plane containing uniform magnetic field 200xx10^(-4)T . When it is displaced slightly from the equilibrium it makes 2 oscillations per second. If the moment of inertia of the needle about the axis of oxcillation is 0.75xx10^-5)kg m^(2) , the magnetic moment of the needle is

A small bar magnet of magnetic moment 9.75 xx 10^(-3) J T^(-1) is suspended from its centre of garvity and is free to rotate in a plane containing a uniform magnetic filed. It is displaced from its stable equilibrium and the period of oscillations is found to be 2.50 s.If the moment of inertia of the magnet about its axis of rotation is 1.25 xx 10^(-5) kg m^(2) , determine of inertia of the magnetic field.

A magnetised needle of magnetic moment 4*8xx10^-2JT^-1 is placed at 30^@ with the direction of uniform magnetic field of magnitude 3xx10^-2T . What is the torque acting on the needle?

When a 12000 joule of work is done on a flywheel, its frequency of rotation increases from 10 Hz to 20 Hz. The moment of inertia of flywheel about its axis of rotation is (pi^(2) = 10)

A circular coil of 16 turns and radius 10cm carrying a current of 0.75A rests with its plane normal to an external field of magnitude 5*0xx10^-2T . The coil is free to turn about an axis in its plane perpendicular to the field direction. When the coil is turned slightly and released, it oscillates about its stable equilibrium with a frequency of 2*0s^-1 . What is the moment of inertia of the coil about its axis of rotation?