53. Implanted medical devices are often charged by transcutaneous energy transfer (TET), which usesa pair of coils in close proximity for wireless charging. The change of current in the coil outsidethe body causes the magnetic flux of the coil inside the body to change, thus generating an inducedelectromotive force. There are 10 coils with a radius of 1 cm, and the current of the outer coildrops from 10 A to 0, within 6 × 10-6 s, what is the average induced electromotive force of theinner coil? (Magnetic constant μ0 is 4π ✖ 10-7 T●m/A.)
(A) 2.58 V
(B) 2.79 V
(C) 3.05 V
(D) 3.29 V
(E) 3.54 V