S98(3) - Physics 4B FINAL EXAM Chapters 22 - 34 Spring 1998...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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 π r = (2.00x10 - 7 )(0.160) 0.00200 B 1 = 16.0 μ T (c)Using the definition of magnetic field, r F
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

S98(3) - Physics 4B FINAL EXAM Chapters 22 - 34 Spring 1998...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online