Medical devices implanted inside the body are often powered using transcutaneous energy transfer (TET), a type of wireless charging using a pair of closely spaced coils. An emf is generated around a coil inside the body by varying the current through a nearby coil outside the body, producing a changing magnetic flux. Calculate the average induced emf (in V) if each 14.0-turn coil has a radius of 1.40 cm and the current in the external coil varies from its maximum value of 13.5 A to zero in 7.25 ✕ 10−6 s answer in V

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