Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field $B$ = $B_0\hat{k}$
  • AThey have equal $z$-components of momenta
  • B
    They must have equal charges
  • C
    They necessarily represent a particleantiparticle pair
  • DThe charge to mass ratio satisfy:${\left( {\frac{e}{m}} \right)_1} + {\left( {\frac{e}{m}} \right)_2} = 0$
Easy
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