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

A uniform magnetic field is obtained in

In a uniform magnetic field, the field lines are :

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:

What is the nature of lines of force in a uniform magnetic field?

The lines of force of uniform magnetic field

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