Physics - Magnetism Question with Solution | TestHub

An electric current$\mathrm{i}$enters and leaves a uniform circular wire of radius$\mathrm{a}$through diametrically opposite points. A charged particle$\mathrm{q}$moving along the axis of the circular wire passes through its centre at speed$\mathrm{v}$. The magnetic force acting on the particle when it passes through the centre has a magnitude