The table below shows the resistivity, length, and diameter of two cylindrical wires, X X\,X and YYY.
| Resistivity | Length | Diameter | |
|---|---|---|---|
| Wire XXX | ρ\rhoρ | LLL | ddd |
| Wire YYY | 8ρ8\rho8ρ | 3L | 2d2d2d |
The resistance of wire X X\,X is RRR.
What is the total resistance of the two wires when they are connected in parallel?
67R\frac{6}{7}R76R
76R\frac{7}{6}R67R
1213R\frac{12}{13}R1312R
1312R\frac{13}{12}R1213R
37 exam-style questions on AQA A Level Physics Current electricity, covering Basics of electricity, Current-voltage characteristics, Resistivity, Circuits, Potential divider, and Electromotive force and internal resistance. Each one has a worked solution and a mark scheme showing where the marks go.