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Class 12 › Physics › Moving Charges and Magnetism
CBSE2019Class Class 12 · Physics1 Marks · Mcq✅ Verified
When a charged particle moves perpendicular to a magnetic field, then
A. speed of the particle is changed
B. speed of the particle remains unchanged
C. direction of the particle remains unchanged
D. acceleration of the particle remains unchanged
✅ Answer & Solution
✅ Correct Answer: B
When a charged particle moves perpendicular to a magnetic field, the magnetic force $F = qvB$ acts as a centripetal force, changing only the direction of velocity — not its magnitude.
$$F = qvB \perp v \Rightarrow \text{no work done} \Rightarrow \text{speed unchanged}$$
The particle moves in a uniform circular path.
