The heart produces a weak magnetic field that can be used to diagnose certain he

Question

The heart produces a weak magnetic field that can be used to diagnose certain heart problems. It is a dipole field produced by a current loop in the outer layers of the heart.

1)It is estimated that the field at the center of the heart is 90 pT. What current must circulate around an 8.0-cm-diameter loop, about the size of a human heart, to produce this field?

express your answer to two significant figures and include the appropriate units.

2) What is the magnitude of the heart's magnetic dipole moment?

express your answer to two significant figures and include the appropriate units.

Explanation / Answer

1) According to the listed reference, the magnetic field of a current loop is:

B = o*I/(2*R)

I = 2*B*R/o = 2*90*10-12*(0.08/2) / (4**10-7) = 5.73*10-6 = 5.73 A

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