3. A lightning bolt may carry a current of 1.0x10^4 A for a short time. What is

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3. A lightning bolt may carry a current of 1.0x10^4 A for a short time. What is the resulting magnetic field 140 m from the bolt? Suppose that the bolt extends far above and below the point of observation
4. Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, 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 1.0x10^-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 3.2cm from the neuron A lightning bolt may carry a current of 1.00 x 104 A for a short time. What is the resulting magnetic field 140 m from the bolt? Suppose that the bolt extends far above and below the point of observation, Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. HT Need Help? Meril O o points I Previous Answers sercpg 19 PO45. NMy Notes Ask Your Teacher in our bodies carry weak currents that produce detectable magretic fields. A technique called magnetoencephalography, 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 1.0 x 10 a long wire carrying a current and find the current it must carry to produce T Model the neuron as a a field of this magnitude at a distance of 3.2 cm from the neuron. 6.3e-10 Your response differs from the correct answer by more than 100%. A Need Help? Read

Explanation / Answer

(a)

B = uo I/ 2pi r

= 4pi * 10^-7 ( 1.0* 10^4 )/ 2pi ( 140)

=14.28 * 10^-6 T

for two significant digits

B = 15 uT

(b)

B = uo I/ 2pir

I = B ( 2pi r)/ uo

= 1.0* 10^-15 ( 2pi (0.032)/ 4pi * 10^-7

=0.016 * 10^-8 A

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