53. Implanted medical devices are often charged by transcutaneous energy transfer (TET), which uses a pair of coils in close proximity for wireless charging. The change of current in the coil outside the body causes the magnetic flux of the coil inside the body to change, thus generating an induced electromotive force. There are 10 coils with a radius of 1 cm, and the current of the outer coil drops from 10 A to 0, within 6 × 10-6 s, what is the average induced electromotive force of the inner 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