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Two long wires each oflength I are place...

Two long wires each oflength I are placed on a smooth horizontal table. Wires have equal but opposite charges. Magnitude oflinear charge density on each wire is `lambda`. Calculate the work required to increase the separation between the wires from a to 2a:

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The correct Answer is:
`[p(lambda^(2)l)/(2piin_(0))In(2)]`
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