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Q.

Two long and parallel wires are at a distance of 0.1 m and a current of 5 A is flowing in each of these wires. The force per unit length due to these wires will be

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a

5  ×  10−5  N/m

b

5  ×  10−3  N/m

c

2.5  ×  10−5  N/m

d

2.5  ×  10−4  N/m

answer is A.

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Detailed Solution

F=μ04π  2×i1i2a = 10−7 × 2 × 5 × 50.1=  5 × 10−5N/m
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Two long and parallel wires are at a distance of 0.1 m and a current of 5 A is flowing in each of these wires. The force per unit length due to these wires will be