Medical devices implanted inside the body are oftenpowered using transcutaneous energy transfer (TET),a type of wireless charging using a pair of closely spacedcoils. An emf is generated around a coil inside the bodyby varying the current through a nearby coil outside thebody, producing a changing magnetic flux. Calculate theaverage induced emf if each 10-turn coil has a radius of1.50 cm and the current in the external coil varies from itsmaximum value of 10.0 A to zero in 6.25 x 10-6 s. (Hint:Recall from Topic 19 that the magnetic field at the centerof the current-carrying external coil is B=Nµ0 I / 2R. Assumethis magnetic field is constant and oriented perpendicularto the internal coil.)

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