Question

The magnetic field of the brain has been measured to be approximately 3.0x10-12 T. A simple estimate of the related currents can be obtained by assuming that the magnetic field is due to a single current loop with a diameter of 16 cm (the width of a typical head). What current is needed to produce such a field at the center of the loop?

Answer 1

The field at the centre of the current loop is given by, B = $\mu$ _oI/2R, where R is the radius of the loop, I is the current in the loop and $\mu$ _o= 4 $\pi$ *10^-7H/m

=> I = 2BR/ $\mu$ _o= 3.82*10^-7C