NEET 2007 Physics question
In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio will be proportional to
Answer: (3)
Solution
An ion of charge and mass accelerated through potential gains kinetic energy , so . In the magnetic field it moves on a circle of radius $R =
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