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The polarity of the magnet in a mass spectrometer may need to be reversed when changes...

The polarity of the magnet in a mass spectrometer may need to be reversed when changes are made in the ion source. Why might this be necessary?

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The polarity of the magnet in a mass spectrometer may need to be reversed when changes are made in the ion source. Why might this be necessary?

In the mass spectrometer, charged particle enter in the instrument and when particles cross the instrument then the path made by particles depend only upon CHARGE/MASS ratio and we know that charge is directly related to polarity so the polarity of the magnet in a mass spectrometer need to be reversed when changes are made in the ion source.

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