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The electric field outside a charged lon...

The electric field outside a charged long straight wire is given by `E = (1000)/(r ) V m^(-1)`, and is directed outwards. What is the sign of the charge on the wire ? If two points `A` and `B` are situated such that `r_(A) = 0.2 m` and `r_(B) = 0.4 m`, find the value of `(V_(B) - V_(A))`.

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