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8. You went and messed you knee up doing something (you choose). The doctor says you need to get an MRI to find out what is going on in there. You knee is placed inside a 20cm radius solenoid that is 1m long. This particular MRI machine is designed to create a 5T magnetic field using 100A of current passing through the wires of the solenoid. a) How much magnetic energy is stored in the solenoid? (Assume that the B-field is uniform in the solenoid and drops to zero outside of it right away) b) How many turns of wire does this solenoid have?

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