A proton and an alpha-particle moving with the same velocity enter a uniform magnetic field with their velocities perpendicular to the magnetic field. The ratio of radii of their circular paths is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
When a particle enters a uniform magnetic field, perpendicularly then it moves in circular path of radius, 
Therefore, we can say, 
Let mass of proton be 
and charge is 
,
Mass of alpha-particle be 
with charge 
.
(i)
We know that, 
and 
From eqn (i), 
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