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Two long straight parallel conductors ar...

Two long straight parallel conductors are separated by a distance of 5 cm and carrying current 20 A. what work per unit length of a conductor must be done to increases the separation between conductors to 10 cm, if the current flows in the same direction ?

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`(W)/(1)=(mu_(0)1_(1)1_(2))/(2pi)ln.(r_(2))/(r_(1))=27.6muJ//m`
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