In the frame work of wires shown in figure, a current I ampere is flowing. Find the magnetic field at O.

The wire loop shown in figure carries a current as shown. The magnetic field at the centre O is ,

The wire loop shown in figure carries a current as shown. The magnetic field at the centre O is ,

A current carrying wire is bent in the L shapes as shown in figure. The length of both arms extend to infinity. Then, the magnetic field at O is-

A current carrying wire is bent in the L shapes as shown in figure. The length of both arms extend to infinity. Then, the magnetic field at O is-

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 wire loop formed by joining two semicircular wires of radii R_1 and R_2 carries a current I as shown in figure. Find the magnetic field induction at the centre O.

An arbitrary shaped closed coil is made of a wire of length L and a current I ampere is flowing in it. If the plane of the coil is perpendicular to magnetic field vecB , the force on the coil is