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Two long, straight wires carry equal currents of 0.56 A. The two wires are parallel to...

Two long, straight wires carry equal currents of 0.56 A. The two wires are parallel to each other and carry parallel currents. What is the magnetic field at a midpoint between the two wires, if the wires are 0.5 cm apart? The magnetic field of a long, straight wire is: B=(μ_0 i)/2πr What is the force per unit length of one of the wires in number 2 on the other? Please show the derivation for the second equation used (u0*i1*i2/2pir)

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Answer #1

the magnetic field due to the wire would be in opposite direction so net magnetic field is zero at midpoint

F/L = uo I1I2 / 2pi*r

= 4pi*10^-7*0.56*0.56 / 2pi*0.005

= 1.254*10^-5 N/m

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