Singly-ionised atoms accelerated by a 20 kV potential enter a region with a magnetic field at right angles to the ion beam. The ion beam is deflected, so that after travelling 20 cm in the magnetic field atoms of a selected mass exit through a slit at right-angles to the input beam. Calculate the magnetic field required to select carbon-12 atoms.

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Singly-ionised atoms accelerated by a 20 kV potential enter a region with a magnetic field at right angles to the ion beam. The ion beam is deflected, so that after travelling 20 cm in the magnetic field atoms of a selected mass exit through a slit at right-angles to the input beam. Calculate the magnetic field required to select carbon-12 atoms.

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