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Q.

Two parallel wires of length 9 m each are separated by a distance 0.15 m. If they carry equal current in the same direction and exerts a total force of 30 ×10−7 N on each other, then the value of current must be

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a

2.5 A

b

3.5 A

c

1.5 A

d

0.5 A

answer is D.

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Detailed Solution

F=  10−7  ×  2i2a × l⇒30 × 10−7 =10−7  ×2i2 0.15 × 9⇒  i=0.5  A
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