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Begin with a long wire of radius rr=0.38 mm and bend it into a long solenoid...

Begin with a long wire of radius rr=0.38 mm and bend it into a long solenoid of radius RR=11 cm. Suppose current II=10 mA is flowing through the wire. Calculate the magnetic-energy density inside the solenoid.
Note: The radius rr includes the layer of protective insulation around the wire.

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