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Physics (Electricity)

I need some help with 8)a) as I don't know how to approach this question... Please show working out!

Physics (Electricity) I need some help with 8)a) as I don't know how to approach this-example-1
User Yorbro
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2 Answers

3 votes
Here are the 4 parts a-d.  
Physics (Electricity) I need some help with 8)a) as I don't know how to approach this-example-1
User Robince
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8(a) charges at A and B are 4q(of which its initially q and later 3q is added) and q respectively.

answer is
4*4*10^(-5)
User DecPL
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