A proton, a deuteron and an $$\alpha $$ particle are accelerated through same potential difference and then they enter in a normal uniform magnetic field, the ratio of their kinetic energies will be:
The correct option is B $$1:1:2$$
Answer is B
Charge of proton is +e
Charge of deuteron is +e
Charge of alpha particle is +2e
Kinetic energy in an electric field having potential V, say at a point x, is directly proportional to charge.
Therefore ratio of kinetic energies are 1:1:2 i.e. ratio of their charges.