Question

Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field

• A. They have equal z-components of momenta.
• B. They must have equal charges.
• C. They necessarily represent a particle - antiparticical pair
• D. The charge to mass ratio satisfy : $\left( \frac { \mathrm { e } } { \mathrm { m } } \right) _ { 1 } + \left( \frac { \mathrm { e } } { \mathrm { m } } \right) _ { 2 } = 0$

Answer 1

Answer: (D)

The charge to mass ratio satisfy :

$\left( \frac { \mathrm { e } } { \mathrm { m } } \right) _ { 1 } + \left( \frac { \mathrm { e } } { \mathrm { m } } \right) _ { 2 } = 0$

Answer 2

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 (4) holds goods.