CBSE 2025 · Region 4 · Set 3 · Q2 · 1 mark

Three wires A, B and C of the same material have lengths and area of cross-sections as $\displaystyle \left(2 l, \frac{\mathrm{~A}}{2}\right),(l, \mathrm{~A})$ and $\displaystyle \left(\frac{l}{2}, 2 \mathrm{~A}\right)$, respectively. If the resistances of these wires are $\displaystyle \mathrm{R}_{\mathrm{A}}, \mathrm{R}_{\mathrm{B}}$ and $\displaystyle \mathrm{R}_{\mathrm{C}}$ respectively, then :

CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.