A particle moves in a circle of diameter 1.0 cm under the action of a magnetic field of 0.40 T. An electric field of 200 V m−1 makes the path straight. Find the charge/mass ratio of the particle.
r=0.5×10−2 m, B=0.4t, E=200 v/m
The path will straighten if
⇒ V=EB=500 m/s.