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8_Chapter 15 HomeworkCH15 Electric Forces and Electric Fields

# 8_Chapter 15 HomeworkCH15 Electric Forces and Electric Fields

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8 CHAPTER 15 15.4 The attractive forces exerted on the positive charge by the negative charges are shown in the sketch and have magnitudes () 1 22 23 2 and 2 2 ee kq FF F aa a == = = 2 e 2 cos45 0.707 1.35 2 e x FFF a  Σ= + ° = + =   2 and 2 13 2 sin45 0.707 1.35 2 e y a Σ=+ ° = + = ()() 2 2 2 2 1.91 e Rx y a =Σ + Σ = and 11 tan 1 45 −− tan y x F F θ Σ = ° Σ so 2 2 1.91 along the diagonal toward the nega e R a = F G tive charge ±²³ ± ± ´ ±² ± µ ² · ² · ² · ² ± ¸ ³´ ³´ ´ ´ 15.5 (a) 2 19 2 9 2 2 15 2 41 .60 10 2 Nm 8.99 10 36.8 N 2 5.00 10 m ke e C r  ×   × = × F (b) The mass of an alpha particle is
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