Two long, straight, parallel wires of length 4.5 m carry parallel currents of 3.

Question

Two long, straight, parallel wires of length 4.5 m carry parallel currents of 3.1 A and 1.1 A.
     (a) If the wires are separated by adistance of 3.4 cm, what is themagnitude of the force between the   two wires?
     (b) If the currents are in oppositedirections (antiparallel), how do the answers to parts (a) and (b)change?
Two long, straight, parallel wires of length 4.5 m carry parallel currents of 3.1 A and 1.1 A.
     (a) If the wires are separated by adistance of 3.4 cm, what is themagnitude of the force between the   two wires?
     (b) If the currents are in oppositedirections (antiparallel), how do the answers to parts (a) and (b)change?

Explanation / Answer

We know that            F = k L I1I2 / d    (a)   F = 2 x 10-7 * 4.5 * 3.1 * 1.1 /0.017            = 1.805 x 10-4 N ( attracts each other) (b) currents are in opposite direction, wires repelseach other.

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