Two long straight parallel conductors A and B, kept at a distance r, carry current I in…
Physics · Class 12 · CBSE — Moving Charges and Magnetism
Two long straight parallel conductors A and B, kept at a distance r, carry current I in opposite directions. A third identical conductor C, kept at a distance \(\left(\frac{r}{3}\right)\) from \(A\) carry current \(I_{1}\) in the same direction as in \(A\) . The net magnetic force on unit length of C is
- \(\frac{3 \mu_{0}{I}\ {I}_{1}}{2 \pi {r}}\) , towards A
- \(\frac{3 \mu_{0}{I}\ {I}_{1}}{2 \pi {r}}\) , towards B
- \(\frac{3 \mu_{0} I\ I_{1}}{4 \pi r}\) , towards \(A\)
- \(\frac{{9} \mu_0 {II}_1}{{4} \pi {r}}\) towards A
Answer
(D) 9 _0 II _1 4 r towards A
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