Question

1) A circle with a radius of 0.3 meters is placed in the x-y plane in a magnetic field directed in the -z direction. It is wound once and its resistance is 5 Ohms. The initial magnetic field is 0.4 Tesla. The magnetic field is then changed in 0.5 s and the average induced current is 0.03 amps running counter-clockwise. First, find the final magnetic field to needed to induce this average current. Then, the magnetic field (still in the -z direction) is held constant at the value of the final magnetic field that was just found. Then, the wire is reshaped into a square that is wound once in a time of 0.004 seconds. If the resistance does not change, what is the average induced current, in amps, when the wire changes shape? If it's clockwise include a negative sign.

Answer 1

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