An electron (mass =9 x 10-31 kg charge =1.6 x 10-19 coul ) whose kinetic energy is joule 7.2 x 10-18 is moving in a circular orbit in a magnetic field of 9 x 10- 5 weber /m2 The radius of the orbit is
(a) 1.25 cm
(b) 2.5 cm
(c) 12.5 cm
(d) 25.0 cm
Correct option**(d) 25.0 cm**
Explanation:
