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Question 20163
JEE Physics · Easy

Magnetism: Circular Orbit Radius MCQ

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Circular Orbit RadiusEasyQuestion 20163

Question

Radius of circular path of charge q, mass m, speed v in uniform field B is:
  1. A
    qB/mv
  2. B
    mv/qB
    Correct
  3. C
    mB/qv
  4. D
    qv/mB

Correct answer

mv/qB

Explanation

Equate magnetic force to centripetal: qvB = mv²/r → r = mv/(qB).

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