An electron emmited by a heated cathode and accelerated through a potential difference of `2*0kV` enters a region with a uniform magnetic field of `0*15T`. Determine the trajectory of the electron if the field (a) is transverse to its initial velocity (b) makes an angle of `30^@` with the initial velocity.

Explanation

(a) Circular trajectory of radius 1.0 mm normal to B. (b) Helical trajectory of radius 0.5 mm with velocity component `2.3 xx 10^7 ms^(-1) ` along B