Two long parallel copper wires carry current of 5 A each in opposite directions. If the wires are separated by a distance of 0.5 m, then the force per unit length between the two wires is

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10−5N/m, attractive

10−5N/m, repulsive

2 × 10−5N/m, attractive

2 × 10−5N/m, repulsive

answer is B.

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Detailed Solution

F= 10−7 × 2i1 ×i2a = 10−7 × 2 × 5 × 50.5= 10−5 N/m (Repulsive)

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