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Two charged particles transverse identic...

Two charged particles transverse identical helical paths in a completely opposite sense in a uniform magnetic field `B=B_0 hatk`.

A

(a) They have equal z-components of momenta.

B

(b) they must have equal charges.

C

(c) They necessarily represent a particle-antiparticle pair.

D

(d) The charge to mass ratio satisfy:
`(e/m)_1+(e/m)_2=0`

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