Deduce an expression for torque acting on a bar magnet placed in uniform external magnetic field.

(a) Derive the expression for the torque acting on a current carrying placed in a magnetic field. (b) Explain the significance of a radial magnetic when current carrying coil is kept in it.

Torque acting on a current loop in a uniform magnetic field is equal to

Deduce the expression for the frequency of revolution of a charged particle in a magnetic field and show that this is independent of the velocity or energy of the particle.

To double the torque acting on a coil of n-turns, when placed in a magnetic field

The final torque on a coil having magnetic moment 25 A m2 in a 5 T uniform external magnetic field, if the coil rotates through an angle of 60^(@) under the influence of the magnetic field is

A coil carrying electric current is placed in uniform magnetic field

Deduce the expression for the torque acting on a dipole of dipole moment vecP in the presence of uniform electric field vecE .

A ferromagnetic material is placed in an external magnetic field. The magnetic domains

A short bar magnet pleaced with its axis at 30^(@) with a uniform external magnetic field of 0.16 Tesla expriences a torque of magnitude 0.032 Joule. The magnetic moment of the bar magnet will be

A short bar magnet placed with its axis at 30^(@) with a uniform external magnetic field of 0.35 T experiences a torque of magnitude equal to 4.5xx10^(-2)Nm . The magnitude of magnetic moment of the given magnet is