In Fig. there is a uniform conducting structure in which each small square has side a. The structure is kept in a uniform magnetic field B. Then the magnetic force on the structure will be

Current loop in a uniform magnetic field

A particle is moving in a uniform magnetic field, then

The figure-4.240 shows ·a square wire mesh made of conducting wires. Here, each small square has side a. The structure is kept in uniform magnetic field B perpendicular to the plane of paper:

The lines of force of uniform magnetic field

Magnetic field at the centre O due to the given structure is

Magnetic field at the centre O due to the given structure is

In case of a uniform magnetic field, the lines of magnetic induction are