Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field B = B0k.

.(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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(d) The charge to mass ratio satisfy : (e/m)1+(e/m)2=0.

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