Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force one wire exerts on the other per metre of length is
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a
2 × 10−4 N/m, attractive
b
2 × 10−4 N/m, repulsive
c
2 × 10−7 N/m, attractive
d
2 × 10−7 N/m, repulsive
answer is A.
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Detailed Solution
F=μ04π 2i1 ×i2a= 10−7 × 2 × 10 × 100.1 =2 ×10−4 N/mDirection of current is same, so force is attractive.