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An infinitely long straight wire carries...

An infinitely long straight wire carries a current `i_(1)`,as shown in the figure.The total force on another wire `CD` of length `l` which is placed so that `c` is at a distance a from the current carrying wire is `(mu_(0)i_(1)i_(2))/(Npi)ln((a^(2)+L^(2))/a^(2))`.Then find value of `N`

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The correct Answer is:
`4`
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