Two wires X X\,X and Y Y\,Y are made from the same metal and have the same electrical resistance.
Which row in the table below identifies a possible pair of values for the dimensions of X X\,X and YYY?
| Length of XXX / cm\text{cm}cm | Diameter of XXX / mm\text{mm}mm | Length of YYY / cm\text{cm}cm | Diameter of YYY / mm\text{mm}mm | |
|---|---|---|---|---|
| A | 60 | 0.30 | 540 | 0.10 |
| B | 60 | 0.30 | 540 | 0.45 |
| C | 60 | 0.30 | 540 | 0.90 |
| D | 60 | 0.30 | 540 | 2.70 |
Row A
Row B
Row C
Row D
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.