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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 N. MC1 Find the magnitude of the electrostatic force acting on the second particle, in N. (A) 4; (B) 12; (C) 18; (D) 36; (E) none of these answer: (D) Newtons 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 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