Need Help? Rees Neurons in our bodies carry weak currents that produce detectabl

Question

Need Help? Rees Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called or MEG, is used to study electrical activity in the brain using this concept. This technique is capable of detecting magnetic fields as weak as 1.0x 10-15 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 4.1 cm from the neuron. 1.67e-10X Your response differs from the correct answer by more than 10%. Double check your calculations. A Need Help? Led wearer come to a long, straight wire carrying 28 A? A cardiac pacemaker can be affected by a static magnetic field as small as 1.7 mT. How close can a pacemaker Need Help? 8 5 3

Explanation / Answer

Given,

B = 1 x 10^-15 T ; d = 4.1 cm = 0.041 m

We know that the magnetic field of a long current carrying wire is given by:

B = u0 I/2 pi r

I = B (2 pi r)/u0

I = 1 x 10^-15 x 2 x pi x 0.041/ 4 pi x 10^-7

I = 10^-15 x 0.041/2 x 10^-7 = 2.05 x 10^-10 A

Hence, I = 2.05 x 10^-10 A

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