The small currents in axons corresponding to nerve impulses produce measurable m

Question

The small currents in axons corresponding to nerve impulses produce measurable magnetic fields. A typical axon carries a peak current of 0.040 A.

Problem 24.12 The small currents in axons corresponding to nerve impulses produce measurable magnetic fields. A typical axon carries a peak current of 0.040 AuA. Part A What is the strength of the field at a distance of 2.2 mm Express your answer with the appropriate units B- 8.10 12 T Submit My Answers Give Up incorrect; Try Again; 5 attempts remaining Provide Feedback Continue

Explanation / Answer

Treat the axon as a long current-carrying wire. The field at a distance r (in metres) is given by:
B = 0.I/(2..r)

B = (4 x 10^-7) x (0.040 x 10^-6) / (2 x x 2.2 x 10^-3)

= 3.636 x 10^-12 T

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