CBSE 2024 · Region 4 · Set 3 · Q5 · 1 mark
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 $\displaystyle \left(\frac{\mathrm{r}}{3}\right)$ from A carry current $\displaystyle \mathrm{I}_{1}$ in the same direction as in A . The net magnetic force on unit length of C is
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \frac{3 \mu_{0} \mathrm{I} \mathrm{I}_{1}}{4 \pi \mathrm{r}}$, towards A
Moving Charges and MagnetismForce between Two Parallel Currents, the AmpereApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.