The main magnet in an MRI machine is a superconducting solenoid 1.8 m long and 70 cm

Question:

The main magnet in an MRI machine is a superconducting solenoid 1.8 m long and 70 cm in diameter. During normal operation, the current through the windings is 120 A and the magnetic field magnitude is 1.5 T. 

(a) How many turns does the solenoid have? 

(b) How much energy is stored in the magnetic field during normal operation? 

(c) How much energy is stored if the current is 50 A?

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