Question

A current carrying circular loop of magnetic moment M⃗ is suspended in a vertical plane in an external magnetic field B⃗ such that its plane is normal to B⃗. The work done in rotating this loop by 45° about an axis perpendicular to B⃗ is closest to :

Assertion (A) : The torque acting on a current carrying coil is maximum when it is suspended in a radial magnetic field. Reason (R) : The torque tends to rotate the coil on its own axis.

With the help of a labelled diagram, explain the working of an ac generator. Obtain the expression for the emf induced at an instant 't'.

A long, straight horizontal wire X'X is held stationary and carries a current of 3.0 A. A square loop MNPS of side 10 cm, carrying a current of 1.0 A is kept near the wire X'X as shown in the figure. Find the magnitude and direction of the net magnetic force acting on the loop due to the wire.