ch22-p085 - 85. (a) For point A, we have (in SI units) q1...

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() ( ) ( ) 91 2 9 1 2 12 22 01 02 8.99 10 1.00 10 C 8.99 10 | 2.00 10 C| || ˆˆ ˆ ii i 44 2.00 5.00 10 5.00 10 ˆ (6.29 N C)i. C qq E rr πε −− ×× × × ⎡⎤ =− = ⎢⎥ × ⎣⎦ G (d) Although a sketch is not shown here, it would be somewhat similar to Fig. 22-5 in the textbook except that there would be twice as many field lines “coming into” the negative charge (which would destroy the simple up/down symmetry seen in Fig. 22-5). 85. (a) For point A , we have (in SI units) ( ) 2 9 1 2 ˆ i 8.99 10 1.00 10 C 8.99 10 | 2.00 10 C| 5.00 10 2 5.00 10 ˆ (1 . 8 0NC ) i . A E =+ × × + ×
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