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A proton, a deuteron and an alpha-particle are moving with the same momentum in a uniform magnetic field. The ratio of magnetic forces acting on then is (How many?) and their speeds are in the ratio (Is how many?)
A) 2:1:1 and 4:2:1
B) 1:2:4 and 2:1:1
C) 1:2:4 and 1:1:2
D) 4:2:1 and 2:1:1

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