A proton, a deuteron and an α 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:
A
2:1:3
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B
1:1:2
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C
1:1:1
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D
1:2:4
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Solution
The correct option is B1:1:2 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.