BIO Transcranial Magnetic Stimulation Transcranial magnetic stimulation (TMS) is

Question

BIO Transcranial Magnetic Stimulation

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, as shown in the figure.(Figure 1) When the current in the loop is changed rapidly, the magnetic field it creates can change at the rate of 3.00×104T/s. This rapidly changing magnetic field induces an electric current in a restricted region of the brain that can cause a finger to twitch, bright spots to appear in the visual field (magnetophosphenes), or a feeling of complete happiness to overwhelm a person.

If the magnetic field changes at the previously mentioned rate over an area of 1.20×10?2 m2 , what is the induced emf?

Explanation / Answer

e = dphi/dt

e = d(AB)/dt

e = AdB/dt

dB/dt = 3 x 10^4 T/s

A = 1.2 x 10^-2 m^2

e = 360 V

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