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Unformatted text preview: Physics 1302 Spring 2009 Week 1 Discussion Two very small, identical, conducting spheres have net charges q 1 = 2 q and q 2 = 6 q ( q > 0) and are separated by a distance d such that the magnitude of the electrostatic force exerted on the first particle (the one with charge q 1 ) is 36 μ N. MC1 Find the magnitude of the electrostatic force acting on the second particle, in μ N. (A) 4; (B) 12; (C) 18; (D) 36; (E) none of these answer: (D) Newton’s third law! MC2 If the two spheres were momentarily touched together and returned to their original positions, find the magnitude of the electrostatic force acting on the first sphere, in μ N. (A) 4; (B) 12; (C) 18; (D) 36; (E) none of these answer: (B). The total charge is 4 q , and will split evenly. Then we have F(before) = kq 1 q /d 2 = k (12 q 2 ) /d 2 and F(after) = k ( 2 q ) / d 2 = 4 kq 2 /d 2 . The ratio F(after)/ F(before) = 4 / 12....
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 Spring '08
 Marshak

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