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Q.

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.
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