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Figure shows two rings having charges Q and `- sqrt(5)Q`. Find potential difference a and B i.e. `(V_(A)-V_(B))`.

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`V_(A) = (KQ)/(R ) + (K(-sqrt(5)Q))/(sqrt((2R)^(2) + (R )^(2)))`
`V_(B) = (K(-sqrt(5)Q))/(2R) + (K(Q))/(sqrt((R )^(2) + ( R)^(2)))`
From above we can easily find `V_(A) - V_(B)`.
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