# Ch16 HW1 - Ch16 HW1 F2010 9:08 PM Stefan Coreth PY 208...

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12/17/10 9:08 PM Ch16 HW1 F2010 Page 1 of 3 http://www.webassign.net/[email protected]/[email protected] Current Score : 20.75 / 22.5 Due : Friday, September 10, 2010 11:25 AM EDT 1. 7.25/8.5 points Question: MI3 16.2.X.019 A plastic rod 1.7 m long is rubbed all over with wool, and acquires a charge of -8e-08 coulombs. We choose the center of the rod to be the origin of our coordinate system, with the x -axis extending to the right, the y -axis extending up, and the z -axis out of the page. In order to calculate the electric field at location A = < 0.7, 0, 0 > m, we divide the rod into 8 pieces, and approximate each piece as a point charge located at the center of the piece. (a) What is the length of one of these pieces? .2125 0.212 m (b) What is the location of the center of piece number 4 ? < 0 0 , .10625 0.106 , 0 0 > m. (c) How much charge is on piece number 4 ? (Remember that the charge is negative.) -5e-9 -1.00e-08 coulombs (d) Approximating piece 4 as a point charge, what is the electric field at location A due only to piece 4 ?

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