CBSE 2023 · Region 3 · Set 3 · Q3 · 1 mark
Two thin long parallel wires A and B are separated by a distance r and carry current I each in the same direction. The force per unit length exerted by $\displaystyle A$ on wire $\displaystyle B$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \frac{\mu_{0} \mathrm{I}^{2}}{2 \pi \mathrm{r}}$, attractive
Moving Charges and MagnetismForce between Two Parallel Currents, the AmpereApplymcqeasy
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.