# S98s(3) - Physics 4B 1998 FINAL EXAM Chapters 22 34 Spring...

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1 Physics 4B FINAL EXAM Chapters 22 - 34 Spring 1998 Name:_________________________________________ Posting Code _____ _____ _____ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 10 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. If you want your grade posted, put alphanumeric characters in the three spaces at the top right. 1. The charge q 1 =+10.0μC and the charge q 2 =-12.0μC. At some instant in time they are a distance 5.60cm apart as shown at the right. (a)Sketch the electric field of the charge q 1 in the drawing at the right. (b)Find the magnitude of electric field felt by the charge q 2 . (c)Find the electric force on the charge q 2 and (d)sketch the direction of the force vector in the drawing at the right. (b)The electric field felt by q 2 is the field created by the point charge q 1 , E 1 = k q 1 r 2 = (9.00x10 9 ) 10.0x10 ! 6 (0.0560) 2 " E 1 = 2.87x10 7 N C (c)Using the definition of electric field, E 1 = F q 2 ! F = q 2 E 1 = (12.0x10 " 6 )(2.87x10 7 ) ! F = 344N 2. The sketch at the right shows two wires that are perpendicular to the page. Wire 1 carries a current of 160mA into the page and wire 2 carries a current of 120mA out of the page. The wires are 2.00mm apart, 10.0μm in diameter and 3.20m long. (a)Sketch the magnetic field of wire 1 in the drawing at the right. (b)Find the magnitude of magnetic field felt by wire 2. (c)Find the magnetic force on wire 2 and (d)sketch the direction of the force vector in the drawing at the right. (b)The magnetic field felt by wire 2 is the field created by the long straight wire 1, B 1 = μ o I 1 2 ! r = (2.00x10 " 7 )(0.160) 0.00200 # B 1 = 16.0 μ T q 1 q 2 5.60cm E 1 F wire 1 B 2.00mm 2 F

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2 (c)Using the definition of magnetic field, r F = I 2 r l !
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S98s(3) - Physics 4B 1998 FINAL EXAM Chapters 22 34 Spring...

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