A wire loop is formed by joining two semicircular wires of radii `r_1 and r_2` as shown in the figure . The loop carries a current I, find the magnetic field at the centre O.

A rectangular loop of metallic wire is of length a and breadth b and carries a current I . Find the magnitude of magnetic field at the centre O of the loop.

The current flows form A and B as shown in the figure. The direction of the indueced current in the loop is

A hexagonal loop of a metallic wire is of each side a and carries a current I . Find the magnitude of magnetic field at the centre of the loop.

Consider the circuit as shown in the figure. Where APB and AQB are semi-cricles. What will be the magnetic field at the centre C of the circular loop?

Does the torque acting on a loop carrying current in a magnetic field depend upon the shape of the loop.

Two insulating infinitely long wires are lying mutually perpendicular to each other as shown in the figure. If the two wires carry currenst I_1 and I_2 as shown in the figure, find the magnetic field at point P (A,b).

Two identical circular wires P and Q each of radius R and carrying current 'I' are kept in perpendicular planes such that they have a common centre as shown in the figure. Find the magnitude and direction of the net magnetic field at the common centre of the two coils.

Under what circumstances, will a current carrying loop not rotate in the magnetic field?