Ch 15 hw 1

# Ch 15 hw 1 - y-axis extending up, and the z-axis out of the...

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1. [MI02 15.E.02.] 1/1 points | 1/4 submissions Last Response | Show Details When calculating the electric field of an object with electric charge distributed approximately uniformly over its surface, what is the order in which you should do the following operations? Type the letters of the steps in order, separated by commas. (For example, you might type z,w,y,x if operation "z" were to be done first, etc.) a. Check the direction and units b. Write an expression for the electric field due to one point-like piece of the object c. Divide up the object into small pieces of a shape whose field is known d. Sum the vector contributions of all the pieces Order of steps: c,b,d,a [c,b,d,a] 2. [MI02 15.E.01.alt01.] 9/9 points | 3/4 submissions Last Response | Show Details All Responses Notes A plastic rod 1.5 m long is rubbed all over with wool, and acquires a charge of -9e-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

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Unformatted text preview: 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? 0.1875 [0.188] m (b) What is the location of the center of piece number 7 ? < 0 [0] , -0.46875 [-0.469] , 0 [0] > m. (c) How much charge is on piece number 7 ? (Remember that the charge is negative.) -1.125e-8 [-1.12e-08] coulombs (d) Approximating piece 7 as a point charge, what is the electric field at location A due only to piece 7 ? 7 = < -118.5377 [-119] , -79.3779 [-79.4] , 0 [0] > N/C (e) To get the net electric field at location A , we would need to calculate due each of the 8 pieces, and add up these contributions. If we did that, which arrow would best represent the direction of the net electric field at location A ? g [ g ]...
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## This note was uploaded on 03/31/2008 for the course PY 208M taught by Professor Chabay during the Spring '08 term at N.C. State.

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Ch 15 hw 1 - y-axis extending up, and the z-axis out of the...

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