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Q.

Two long parallel conducting wires carrying currents are separated by a distance ‘x’. Work done per unit length in changing the distance between the wires is proportional to

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a

1logex

b

x

c

1x

d

logex

answer is C.

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Detailed Solution

We know that

Fl=μ0i1i22πx

dW=Fdx

∫dW=∫μi1i22πxdx=μi1i22πlogex

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Two long parallel conducting wires carrying currents are separated by a distance ‘x’. Work done per unit length in changing the distance between the wires is proportional to