Assignme - O MasteringPhysics Ch2t × i+ session mastenn physics.com my ct/itemv

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Assignme - O MasteringPhysics Ch2t × i+ session mastenn physics.com my ct/itemv e s?assignmentProbler O-59503 84 2016SP Physics 150B Ch 20 Part2 Problem 20.69 Problem 20.69 previous 1 6 of Part A Three long, straight electrical cables, running north and south, are tightly enclosed in an insulating sheath. One of the cables carries a 22.9 A current southward, the other two carry currents of 17.2A and 12.4 A northward. Use Ampere's law to calculate the magnitude of the magnetic field at a distance of 100 m fron the cables Express your answer to two significant figures and include the appropriate units. B-Value Units Submit My Answers Give Up Incorrect; Try Again; 3 attempts remaining

Explanation / Answer

d =10 cm,

i1 =- 22.9 j A, i2 = 17.2 j A, i3 =12.4 j A

ienclosed = -22.9+17.2+12.4 = 6.7 A

uo =4pi*10^-7 T.m/A

From Ampheres law

integration of (B.dl) = uo*i

B = uoi/2pi*d

B = (2*10^-7*6.7)/0.1

B =1.34*10^-5 T

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