Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field 
:
A
They have equal 
-component of momenta
-component of momenta
B
They must have equal charges
C
They necessarily represent a particle and anti-particle pair
D
The charge to mass ratio satisfy 
Text Solution
Verified by ExpertsThe correct answer is:
D
For given pitch d correspond to charge particle, we have
Since, charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field 
for two particles should be same and of opposite sign. Therefore,
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