An experimenter is studying the electrical resistance of various metal wires. All the wires are made of the same alloy but have different lengths and diameters.
After measuring the resistance of a reference wire, which of the following wires is guaranteed to have a smaller resistance than the reference wire?
a longer wire with a smaller diameter
a longer wire with the same diameter
a wire of the same length with a smaller diameter
a shorter wire with a larger diameter
132 exam-style questions on CIE IGCSE Physics 4.2.4a Resistance. Each one has a worked solution and a mark scheme showing where the marks go.