In an experiment performed using a cloud chamber (a device that can show the tracks of subatomic

particle) the nature of a particle can be analysed. Under the influence of a strong perpendicular magnetic

field B directed into the plane of paper, a particle track like the one shown beside as p q was obtained.

The track shown may depict

A

a proton of (charge +e) moving from p to q

B

an alpha particle of (charge +2e) moving from p to q

C

an electron of (charge -e) moving from q to p

D

a neutron of (charge zero) moving from p to q