Physics (AS & A Level) · Oct / Nov 2022 · Paper 11 · Question 33
9702Resistance and resistivity
A copper wire is to be replaced by an aluminium alloy wire of the same length and resistance. Copper has half the resistivity of the alloy. What is the ratio (diameter of alloy wire)/(diameter of copper wire)?
- A√2
- B2
- C2√2
- D4
As printed in the paper
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Correct answer: A. √2
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