NEET2019Physics-Magnetism
NEET 2019 Physics Motion of Charged Particles in Magnetic Field MCQ Question
Type: MCQ-numerical-Medium-Class 12
Ionized hydrogen atoms and α-particles with same momenta enter perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rₕ : rₐ will be:
A
4 : 1
B
1 : 4
C
2 : 1
D
1 : 2
Correct Answer
Option C
Detailed Explanation
The radius of the path in a magnetic field is proportional to the momentum and inversely proportional to the charge. Since α-particles have twice the charge of hydrogen ions, the radius ratio is 4:1.
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