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 path 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

1. A. 1/R 2
2. B. R 2
3. C. R
4. D. 1/R

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