A uniform magnetic field of 3000 G is established along the positive z-direction.A rectangular loop of sides 10 cm and 5 mc carries a current of 12A.What is the torque on the loop in the different cases corresponds to stable equilibrium ?

A student placed a rectangular loop carrying current in between the pole pieces of two magnetics and found that the loop is rotating. At what position will the coil be in stable equilibrium?

A rectangular loop of area A and carrying a steady current I is placed in a uniform magnetic field:-Derive the expression of torque, tau = barmxxbarB acting on the loop.

A short bar magnet of magnetic moment m= 0.32JT^-1 is placed in a uniform extemal magnetic field of 0.15T. If the bar is free to rotate in the plane of the field, which orientations would correspond to its (i) stable and (ii) unstable equilibrium? What is the potential energy of the magnet in each case?

An element dl = dxi is placed at the origin and carries a large current I = 10A. What is the magnetic field on the y-axis at a distance of 0.5m. dx = 1cm

A 100 turn closely wound circular cell of radius 10 cm carries a current of 3.2A (a) what is the field at the centre of the coil? (b) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field 2 T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^(o) under the influence of the magnetic field (c) What are the magnitudes of the torques on the coil in the initial and final position? (d) What is the angular speed acquired by the coil when it has rotated by 90^(o) ? The moment of inertia of the coil is 0.1 kg m^(2) .