2049_ch22 - Chapter 22: Electric Field PHY2049: Chapter 22...

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PHY2049: Chapter 22 1 Chapter 22: Electric Field
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PHY2049: Chapter 22 2 Electric Field of Single Point Charge 2 ˆ kq Er r = G 2 ˆ kq E r r =− G
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PHY2049: Chapter 22 3 Example: Electric Field on Proton Î At surface of proton ± q = e = 1.6 x 10 -19 C ± r = 10 -15 m Î E points radially outward for + charge ( )( ) () 91 9 21 22 15 0 1 . 61 0 1.44 10 N/C 10 kq E r ×× == = ×
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PHY2049: Chapter 22 4 E Field of Two Equal, Positive Point Charges
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PHY2049: Chapter 22 5 E Field of Two Equal, Unlike Point Charges
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PHY2049: Chapter 22 6 Field Between Two Charged Parallel Plates Î Assume plates are much larger than separation ± E is approx. constant between plates ± E is zero outside the plates ± This is a capacitor! Î E points from + plate to – plate Î We will calculate E in Chap. 23 ± Gauss’ law ± Proportional to surface charge density
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PHY2049: Chapter 22 7 1. Rank magnitude of E at P 1 , P 2 , P 3 . Assume charges on rings are +q and +q
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PHY2049: Chapter 22 8 Answer to Question #1 Î P 1 has E = 0 since it is equidistant from ring A and B and they are same sign. Î P 3 has largest E because it has contributions from ring A and B Î P 2 has no contribution from ring B because it is at the center, thus it is only affected by ring A.
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2049_ch22 - Chapter 22: Electric Field PHY2049: Chapter 22...

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