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A wire forms a loop in the shape of an equilateral triangle. A magnetic field of magnitude 1.30 T passes through the loop such that the field is perpendicular to the plane of the loop. During a time interval of 15.0 ms, the loop is rapidly reshaped into a circle. Find the diameter of the circle if the magnitude of the average potential induced around the loop during this process is 2.10 V.
Answer: 3.90 cm
Please explain!
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