A student investigates the electrical resistance of various metal wires made of the same material. The wires have different lengths and diameters. After measuring the resistance of a baseline wire, which of the following is guaranteed to have a smaller resistance?
a longer wire with the same diameter
a wire of the same length with a smaller diameter
a longer wire 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.