AIPMT MAINS2012Physics-Magnetism
AIPMT MAINS 2012 Physics Motion of Charged Particles in Magnetic Field MCQ Question
Type: MCQ-numerical-Medium-Class 12
A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an α-particle to describe a circle of same radius in the same field?
A
2 MeV
B
1 MeV
C
0.5 MeV
D
4 MeV
Correct Answer
Option B
Detailed Explanation
The radius of the path in a magnetic field depends on the charge-to-mass ratio and kinetic energy. For the α-particle to have the same radius as the proton, its kinetic energy must be the same, i.e., 1 MeV.
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