Physics (AS & A Level) · Oct / Nov 2022 · Paper 13 · Question 33

Two wires, P and Q, have the same resistance. Wire Q is made of material that has twice the resistivity of the material used to make wire P. The diameter of wire Q is twice the diameter of wire P. What is the ratio \frac{\text{length of wire P}}{\text{length of wire Q}}?

1. A\frac{1}{8}
2. B\frac{1}{4}
3. C\frac{1}{2}
4. D\frac{2}{1}

As printed in the paper