Medical devices implanted inside the body are often powered using transcutaneous

Question

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 13.0-turn coil has a radius of 1.30 cm and the current in the external coil varies from its field at the center of the current-carrying external coil is B NHO. Assume this magnetic field is constant over the interior coil's area and 2R oriented perpendicular to the internal coil.) HINT 8.35 xv Need Help? Read It

Explanation / Answer

e = d (flux) /dt

e = NA dB/dt

e = (N A N u0 / 2 R) dI/dt

e = (13^2 x pi x 0.013^2 x 4pi x 10^-7 / 2(0.013)) (10.5 / (6.75 x 10^-6))

e = 67.5 Volt

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