In a mass spectrometer, an ion of charge, q, and mass, m,...
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
qBrm
mrqB
qmBr
mqr
Correct answer is A
F = qvB ( force on moving charge in a magnetic field) F = mv2r
equating F
qvB = mv2r
qB = mvr
qBr = mv
Therefore, v = qBrm
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