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Two long and parallel straight wires A and B carrying currents of 10.0 A and 4.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.

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Situation given in the statement is shown in above diagram.
Here, magnetic force exerted on l length of first wire is,
`F=(mu_(0)I_(1)I_(2)l)/(2piy)`
`thereforeF=((4pixx10^(-7))(8)(5)(0.1))/((2pi)(0.04))`
`thereforeF=2xx10^(-5)N`
(Direction : towards wire B, attractive in nature)
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