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Q.

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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a

10−5N/m,  attractive

b

10−5N/m,  repulsive

c

2 × 10−5N/m,  attractive

d

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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