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In a mass spectrometer, an ion of charge, q, and mass, m, moving in a...

Physics
WAEC 2023

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. \(\frac{qBr}{m}\)
  • B. \(\frac{mr}{qB}\)
  • C. \(\frac{qm}{Br}\)
  • D. \(\frac{mq}{r}\)
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Correct Answer: Option A
Explanation

F = qvB ( force on moving charge in a magnetic field) F = \(\frac{mv^2}{r}\)

equating F

qvB =  \(\frac{mv^2}{r}\)

qB =   \(\frac{mv}{r}\)

qBr = mv 

Therefore, v =   \(\frac{qBr}{m}\)


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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts