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Science · 2024 · 2 marks
CBSE 2024 · Region 4 · Set 1 · Q26
Two wires A and B of same material, having same lengths and diameters $\displaystyle 0.2$ mm and $\displaystyle 0.3$ mm respectively, are connected one by one in a circuit. Which one of these two wires will offer more resistance to the flow of current in the circuit ? Justify your answer.
Marking-scheme solution
Wire A will offer more resistance
Justification:\(\displaystyle \mathrm{R} \propto \frac{l}{\mathrm{~A}}\) /thinner the wire, more resistance to the flow of current.
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.