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Semiconductors and Superconductors

The magnetic ...

Question

The magnetic field is generated by superconducting coils with the help of liquid helium in MRI. It can reduce the temperature of the coil to around :

10 K

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20 K

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4 K

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1 K

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Solution

The correct option is C 4 K
It is required to reduce resistance in the coil to zero to generate high magnetic field. Hence, liquid nitrogen helium is used. Helium cryogen has boiling point of 4.3K. So in liquid state it maintains temperature upto 4K.

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