Question

Two charged particles traverse identical helical paths in a
completely opposite sense in a uniform magnetic field
B = B₀ kˆ .
(a) They have equal z-components of momenta
(b) They must have equal charges
(c) They necessarily represent a particle, anti-particle pair
(d) The charge to mass ratio satisfy
(e/m)₁ + (e/m)₂ = 0

Answer 1

Explanation:

Solution : In a uniform magnetic field, the two charged particles will traverse identical helical paths in a completely opposite sense if the charge/mass ratio of these two particles is same and charges on them are of opposite character.