WAEC Physics 2023 Objective — Question 8
Question 8 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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In a mass spectrometer, an ion of charge q, and mass, m, moving in a path of radius, r, in a field of flux density, B, has a speed of
- A. mr/qB
- B. qr/Br
- C. Bqr/mCorrect
- D. mq/Br
Explanation
The magnetic force provides centripetal force: Bqv=mv²/r → v=Bqr/m.
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