Transcranial magnetic stimulation (TMS) is a noninvasive method for studying bra

Question

Transcranial magnetic stimulation (TMS) is a noninvasive method for studying brain function, and possibly for treatment as well. In this technique, a conducting loop is held near a person's head. When the current in the loop is changed rapidly, the magnetic field it creates can change at a rate of 3.00 104 T/s. This rapidly changing magnetic field induces an electric current in a restricted region of the brain that can cause a finger to twitch, a bright spot to appear in the visual field, or a feeling of complete happiness to overwhelm a person. If the magnetic field changes at the previously mentioned rate over an area of 1.85 10-2 m2, what is the induced emf?
? V

Explanation / Answer

ll = l/tl = lAB/tl = AlB/tl

= 1.85 x 10^-2 m^2 x 3 x 10^4 T/s

= 555 V

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