Magnetoencephalography (MEG) is a noninvasive method for studying electrical act

Question

Magnetoencephalography (MEG) is a noninvasive method for studying electrical activity in the brain. It is based on the principle that an electric current creates a magnetic field, whether the current is in a wire or in the neurons of a brain. Thus, your very thoughts at this moment are generating measurable magnetic fields outside your head. With today's technology, an MEG can detect magnetic fields as small as 1.28E-15 T. Approximating a neuron by a straight wire, what electric current is needed to produce this magnetic field strength at a distance of 3.46 cm?

Explanation / Answer

magnetic field B = uo i /2 pi d

so

Current I = B * 2 pi d /uo

I = 1.28 *10^-15 * 0.0346 * 2pi /( 4*3.14 *10^-7)

I = 2.21 *10^-10 AMps (ANSWER)

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