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Two charged particles traverse identical...

Two charged particles traverse identical helical paths in a completely opposite sense ina uniform magnetic field `vec (B) = B_0 vec(k)` .

A

they have equal z-components of momenta

B

they must have equal charges

C

they necessarily represent a particle-antiparticle pair

D

the charge to mass ratios satisfy, `[e/m]_1 + [e/m]_2 = 0`

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