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CBSE Class 12 Physics 2023 All Sets Paper

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Question : 2 of 18
Marks: +1, -0
Two long parallel wires kept 2 m apart carry 3A current each, in the same direction. The force per unit length on one wire due to the other is
Solution:  
Given
i1=3 Ai_1 = 3\,\mathrm{A}
i2=3 Ai_2 = 3\,\mathrm{A}
r=2 mr = 2\,\mathrm{m}
Fl=μ02πi1i2r\frac{F}{l} = \frac{\mu_0}{2\pi} \frac{i_1 i_2}{r} =2μ04π×3×32= 2 \frac{\mu_0}{4\pi} \times \frac{3 \times 3}{2}
⇒2×10−7×92\Rightarrow \frac{2 \times 10^{-7} \times 9}{2} = 9×10−7 N/m9 \times 10^{-7} \,\mathrm{N/m} Repulsive
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