Part A Lightning bolts approximately 20 kA. We can model such a current as the e

Question

Part A Lightning bolts approximately 20 kA. We can model such a current as the equivalent of a very long, straight wire. can carry currents up to If you were unfortunate enough to be 4.6 m away from such a lightning bolt, how large a magnetic field would you experience? Express your answer using two significant figures B-4.35 10-4 Submit Previous Answers Request Ans Incorrect: Try Again: 6 attempts remaining Part B How does this field (B) compare to one (B2) you would experience by being 4.8 cm from a long, straight household current of 10 A? Express your answer using two significant figures ?, Submit Request Answer Provide Feedback Next >

Explanation / Answer

Current due to the straight wire is given by:

B1 = u0*i/(2*pi*r)

Using given values:

B1 = 4*pi*10^-7*20*10^3/(2*pi*4.6)

B1 = 8.69*10^-4 T

Part B

Similary for wire 2

B2 = uo*i2/(2*pi*r2)

B2 = 4*pi*10^-7*10/(2*pi*4.6*10^-2)

B2 = 0.434*10^-4

Now

B1/B2 = 8.69*10^-4/(0.434*10^-4) = 20.02

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