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  • Two long parallel wires are at a distance of 1 metre. Both of them carry one ampere of current. The force of attraction per unit length between the two wires isO

Two long parallel wires are at a distance of 1 metre. Both of them carry one ampere of current. The force of attraction per unit length between the two wires is

Option: 1

2 \times 10^{-7} \mathrm{~N} / \mathrm{m}


Option: 2

2 \times 10^{-8} \mathrm{~N} / \mathrm{m}


Option: 3

5 \times 10^{-8} \mathrm{~N} / \mathrm{m}


Option: 4

10^{-7} \mathrm{~N} / \mathrm{m}


Answers (1)

best_answer

\mathrm{F}=\frac{\mu_0}{4 \pi} \times \frac{2 \mathrm{i}_1 \mathrm{i}_2 1}{\mathrm{r}}=10^{-7} \times \frac{2 \times 1 \times 1 \times 1}{1} \\
=2 \times 10^{-7} \mathrm{~N} / \mathrm{m} .

[This relates to the definition of ampere]

Posted by

shivangi.bhatnagar

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