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NEET2007PhysicsMagnetic Effects of CurrentActual

In a mass spectrometer 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 ( charge on the ion mass of the ion ) will be proportional to:

Options

  1. A1 R^2
  2. BR^2
  3. CR
  4. D1 R

Correct answer

A. 1 R^2

Step-by-step solution

Radius of semicircular path R= m v q B = 2 m q V q B As V and B are constant so aligned & R m q q & q m 1 R^2 aligned

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