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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

1. N 4 10 2   , attractive
2. N 4 10 2   , repulsive
3. N 7 10 2   , attractive
4. N 7 10 2   , repulsive

Correct answer: N 4 10 2   , attractive

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