# F97(2) - Physics 4B THIRD EXAM Chapters 22 32 Fall 1997...

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1 Physics 4B THIRD EXAM Chapters 22 - 32 Fall 1997 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles which are on the last page. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. The sketch at the right shows two wires that are perpendicular to the page. Wire A carries a current of 140mA into the page and wire B carries a current of 210mA out of the page. The wires are 2.00mm apart, 12.5μm in diameter and 2.60m long. Find (a)the magnetic field felt by wire B, (b)the force on wire B, (c)the force on wire A and (d)indicate the directions of the quantities in the sketch. (a)The field felt by wire B is the field due to the long straight wire A, B A = μ o I A 2 π r = (2.00x10 - 7 ) 140 2.00 B A = 14.0 μ T . (b)The force on wire B is caused by the field of wire A. Using the definition of magnetic field, r F BA = I B r l × r B A

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