High-field NMR spectrometers,including those used for magnetic resonance imaging in hospitals,contain magnets with superconducting coils,e.g.NbTi which becomes superconducting at 9.5K.
(a)Why is liquid helium used to cool the magnet?
(b)For He,ΔvapH(bp)=0.1kJmol-1.To what process does this refer and why is the value solow?
(c)Suggest why the liquid helium tank in an NMR spectrometer is surrounded by a tank of liquid N2.
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