Transcranial Magnetic Stimulation A recently developed
Chapter 22, Problem 99(choose chapter or problem)
Transcranial Magnetic Stimulation A recently developed method to study brain function is to produce a rapidly changing magnetic eld within the brain. When this technique, known as transcranial magnetic stimulation (TMS), is applied to the prefrontal cortex, for example, it can reduce a persons ability to conjugate verbs, though other thought processes are unaffected. The rapidly varying magnetic eld is produced with a circular coil of 21 turns and a radius of 6.0 cm placed directly on the head. The current in this loop increases at the rate of (by discharging a capacitor). (a)At what rate does the magnetic eld at the center of the coil increase? (b) Suppose a second coil with half the area of the rst coil is used instead. Would your answer to part (a) increase, decrease, or stay the same? By what factor?
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