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16.4 Ex 66 - 67

# 16.4 Ex 66 - 67 - 986 C H A P T E R 16 M U LTI P L E I N T...

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986 C H A P T E R 16 MULTIPLE INTEGRATION (ET CHAPTER 15) If you had arranged the axes differently, you could have computed the answer as 0 , 1 12 , 37 48 (depending on orientation). 66. According to Coulomb’s Law, the force between two electric charges of magnitude q 1 and q 2 separated by a distance r is Cq 1 q 2 / r 2 acting along the line through the two charges ( C is a constant). Suppose that a circular disk of radius R has a uniformly distributed charge of density k Coulombs per square centimeter (Figure 25). Let F be the net force on a charged particle P of magnitude Q coulombs located at a distance d cm vertically above the center of the disk (by symmetry, F acts in the vertical direction). (a) Let R be a small polar rectangle of size r × θ located at distance r . Show that R exerts a force on P whose vertical component is kC Qd ( r 2 + d 2 ) 3 / 2 r r θ (b) Explain why F is equal to the following double integral and evaluate: F = kC Qd 2 π 0 R 0 r dr d θ ( r 2 + d 2 ) 3 / 2 R d Charged plate Δ r Δ P FIGURE 25 SOLUTION (a)

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