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4. A coil consisting of N loops of wire with radius R is initially oriented so that its normal is parallel to the magnetic field

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4. A coil consisting of N loops of wire with radius R is initially oriented so that its normal is parallel to the magnetic field B. During an unknown time interval At the coil is rotated by the angle 0 so that the average EMF in the coil is &. What is Ar? 5. A solenoid of radius R and length / has N turns of wire. The energy stored in he solenoid is EL. What is the current / in the solenoid

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