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A straight , long wire carries a current a current of 20A. Another wire carrying equal current is placed parallel to it. If the force acting on a length of 10cm of the second wire is `(2.0 xx (10^-5)) N`, what is the separation between them?

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Let separation between two wires is d. then `dF = (mu_oi_1i_2)/(2pid) dl`
`rArr 2.0xx10^(-5) = (2xx10^(-7)xx20xx20/(d)`
`rArr d = 40 cm.`
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