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 1.48 E-15 T. Approximating a neuron by a straight wire, what electric current is needed to produce this magnetic field strength at a distance of 6.43 cm?

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