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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2.5 A

3.5 A

1.5 A

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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