Homework Help: Physics

Posted by Mary on Tuesday, August 28, 2007 at 11:08pm.

Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -8q. Sphere B carries a charge of +7q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and separated from it. Lastly, sphere C is touched to sphere B and separated from it.

(a) How much charge ends up on sphere C?

(b) What is the total charge on the three spheres before they are allowed to touch each other?

(c) What is the total charge on the three spheres after they have touched?

Facts

proton mass = 1.673x10^-27 kg
neutron mass = 1.675x10^-27kg
electron mass = 9.11x^10^-31kg

e= 1.60x10^-19C

q=Ne

q respresents electrical charge

How do I put all of this infomation together to answer this question. Am I over thinking this problem. Please help!

Physics - bobpursley, Wednesday, August 29, 2007 at 8:16am
Each time spheres are touched together, one gets on each sphere 1/2 the total charge. When A meets B, then each leave with -1/2 q. So continue this until the touching has ended. The total charge at the end should equal the total charge one began with (-1q)

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