(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I would really appreciate help understanding how the answer is reached in this question:

Setting the scene: three metal sphere's are in fixed positions R (+Q), S (+2Q) and T (+3Q):

+Q +2Q +3Q

*--------------**-------------------------***

R S T

The distance between R and S is d1 and distance between S and T is d2. d2 = sq. root of 3*d1.

A small metal sphere carrying a charge of -2Q is first brought into contact with the sphere at R (+Q), and then into contact with the sphere at S (+2Q) and finally into contact with sphere T (+3Q). After making contact with the three spheres, in the stated order, the charge on the sphere at T is:

A: +3Q

B: +15Q/4

C: +15Q/8

D: +4Q

2. Relevant equations

????? Perhaps F = K Q/r (squared)

3. The attempt at a solution

The solution to this question is C: +15Q/8

I would really really appreciate it if someone could explain how this answer is achieved. Is it perhaps charge accumulation from conduction in some way??

Thanks

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# Homework Help: Understanding charge transfer on metal spheres. Help please!

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