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A proton, deutron and alpha particle are...

A proton, deutron and `alpha` particle are moving with same momentum in uniform magnetic field. The ratio of magnetic forces acting on them is___and their speed are in ratio____

A

`1:2: 4 and 2:1:1`

B

`2:1: 1 and 4:2:1`

C

`4:2: 1 and 2:1:1`

D

`1:2: 4 and 1:1:2`

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The correct Answer is:
B
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