Question

MRI (magnetic resonance imaging) is a medical techniquethatproduces detailed "pictures" of the interior of the body.Thepatient is placed into a solenoid that is 40cm in diameter and1.0 m long.A100 A current creates a 5.0T magnetic field inside thesolenoid. To carry such alarge current, the solenoid wires arecooled with liquid heliumuntil they become superconducting (noelectric resistance).

How much magnetic energy is stored in the solenoid? Assumethatthe magnetic field is uniform within the solenoid and quicklydropsto zero outside the solenoid. (answer in J)

How many turns of wire does the solenoid have?