Moving Charges And Magnetism

A particle of mass \(2.2 \times 10^{-30} \mathrm{~kg}\) and charge \(1.6 \times 10^{-19} \mathrm{C}\) is moving at a speed of \(10 \mathrm{~km} \mathrm{~s}^{-1}\) in a circular path of radius 2.8 cm inside a solenoid. The solenoid has \(25 \frac{\text { turns }}{\mathrm{cm}}\) and its magnetic field is perpendicular to the plane of the particle's path. The current in the solenoid is

(Take, \(\mu_0=4 \pi \times 10^{-7} \mathrm{~Hm}^{-1}\))