2049_ch22

# 2049_ch22 - Chapter 22 Electric Field PHY2049 Chapter 22 1...

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1 PHY2049: Chapter 22 Chapter 22: Electric Field

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2 PHY2049: Chapter 22 Concept Quiz For which situations can we put a charge q’ on the left side of the two charges so that it is in equilibrium? (1) (a) only (2) (a) and (b) (3) (c) and (d) (4) (b) and (d) (5) (c) only Should be near the smaller charge because if it is near the larger charge, there can be no total cancellation
3 PHY2049: Chapter 22 Concept Quiz Which situation has the largest force acting on q? q q q q All E fields are in the same direction in (3). Note that (4) has E = 0.

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4 PHY2049: Chapter 22 Electric Field of Single Point Charge
5 PHY2049: Chapter 22 Example: Electric Field on Proton At surface of proton q = e = 1.6 x 10 -19 C r = 10 -15 m E points radially outward for + charge

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6 PHY2049: Chapter 22 E Field of Two Equal, Positive Point Charges
7 PHY2049: Chapter 22 E Field of Two Equal, Unlike Point Charges

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PHY2049: Chapter 22 Field Between Two Charged Parallel Plates Assume plates are much larger than separation E is approx. constant between plates E is zero outside the plates This is a capacitor! E points from + plate to – plate
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2049_ch22 - Chapter 22 Electric Field PHY2049 Chapter 22 1...

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