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 charge to mass ratio satisfies $(\frac{e}{m})_1 + (\frac{e}{m})_2 = 0$

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