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Two charges particles tranverse identica...

Two charges particles tranverse identical helical paths in a completely opposite sense in a uniform magnetic field `B=B_(0)hatk`.

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 ratio satisfy `((e)/(m))_(1)+((e)/(m))_(2)=0`

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