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Q.

Two long parallel wires carrying equal current separated by 1 m, exert a force of 2 × 10−7N/m on one another. The current flowing through them is

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a

2.0 A

b

2.0 × 10−7  A

c

1.0 A

d

1.0 × 10−7  A

answer is C.

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Detailed Solution

Fl=μ04π × 2i1 ×i2a= μ04π2i2a   ∵  i1 =i2=i ⇒2 × 10−7 =10−7 ×2i2 1 ⇒ i=1A
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Two long parallel wires carrying equal current separated by 1 m, exert a force of 2 × 10−7N/m on one another. The current flowing through them is