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What work is required to bring a charge `q= 3.00 mu C` originally a distance of 1.50 m from a charge `Q= 20.0 muC` until it is 0.50 m away ?

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`W= DeltaU = Kq-Q ((1)/(0.5 ) - ( 1)/(1.5)) = K xx 3 xx 20 xx 10^(-12) [2-(2)/(3)]`
`implies (K xx 3 xx 20 xx 10^(-12) xx 4 )/( 3) = K xx 80 xx 10^(-12)`
`= 0.72J`
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