AAI ATC Junior Executive 25 Mar 2021 Shift 2 Paper

In a chamber, a uniform magnetic field of 4.5 G (1G = 10^-4 T) is maintained. An electron is shot into the field with a speed of 4.8 × 10⁶ m/s normal to the field. Find the radius of the circular orbit? Also obtain the frequency of revolution of the electron in its circular orbit? (e = 1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg) choose an approximate value