A current of 10A passes through two very long wires held parallel to each other and separated by a distance of 2m. What is the force per unit length between them?
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Solution
Force on one wire due to other is F=BI2l where magnetic field B=μ0I12πr due to first wire at distance r.
Thus force per unit length between them is F/l=BI2=μ0I1I22πr=(4π×10−7)×10×102π×2=10−5N/m