Question

Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field `vec(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 satisfy:
`((e)/(m))_(1)+((e)/(m))_(2)=0`.

Answer 1

Correct Answer - D
In the present situation the charge to mass ratio (e/m) of these two particles is same and charges on them are of opposite character. Hence, the situation given in option (d) holds good.