Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field $B = B_0 \hat k$ .

  • A

    They have equal $z-$ components of momenta

  • B

    They must have equal charges

  • C

    They necessarily represent a particle, antiparticle pair

  • D

    The chrge to mass ratio satisfy ${\left( {\frac{e}{m}} \right)_1} + {\left( {\frac{e}{m}} \right)_2} = 0$

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