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# E2 - Phy sics 7B WS E2(rev 3.5 Page 1 E-2 Electric Fields...

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Physics 7B WS E2 (rev. 3.5) Page 1 E-2. Electric Fields Summary An electric force requires two charges. An electric field is produced by a single charge. Questions for discussion 1 . Sketch the electric field created by each of the following point charges. a) q = +1 C b) q = -2 C 2 . A long straight piece of fishing line has been sprayed evenly with positively charged paint. This creates a uniform line charge distribution (as opposed to a point charge ). Sketch the electric field created by this line of charge. How would your picture look if the line were negatively charged? + end view +1 side view + + + + + + + -2 perspective view + + + + + +

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Physics 7B WS E2 (rev. 3.5) Page 2 3 . Next, a large sheet of plastic has been sprayed evenly with positively charged paint. (See figure next page.) This creates a uniform surface charge distribution . Sketch the electric field created by this surface charge. How would your picture look if the sheet were negatively charged? 4 . This time, two charged sheets are placed near each other. One has uniform positive surface charge, while the other has uniform negative surface charge. Sketch the (net) electric field created by the sheets. 5 . Repeat Discussion Question 4 if the sheets are both positively charged. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + perspective view face view (surface charge suppressed) side view + + + + + + + + + + + + + + + + + + side view - - - - - - - - - + + + + + + + + + Side view + + + + + + + + +
Physics 7B WS E2 (rev. 3.5) Page 3 Problems 1 . Two point charges q 1 = +3 C and q 2 = -3 C are fixed in place, as shown. They are separated by 0.4mm, and are centered at the origin. The points A, B, and C in the figure are not point charges. They are merely locations in the x-y plane. a) Is the electric field due to q 1 and q 2 at the origin zero? If so, explain why. If not, find the magnitude of the electric field at the origin. b)

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E2 - Phy sics 7B WS E2(rev 3.5 Page 1 E-2 Electric Fields...

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