An engineer is designing a new superconducting alloy and needs to verify the dimensional consistency of a theoretical model. What are the SI base units of electrical resistivity?
kg m2s−3A−2\text{kg m}^2 \text{s}^{-3} \text{A}^{-2}kg m2s−3A−2
kg m3s−3A−1\text{kg m}^3 \text{s}^{-3} \text{A}^{-1}kg m3s−3A−1
kg m3s−3A−2\text{kg m}^3 \text{s}^{-3} \text{A}^{-2}kg m3s−3A−2
kg m3s−2A−2\text{kg m}^3 \text{s}^{-2} \text{A}^{-2}kg m3s−2A−2
29 exam-style questions on OCR A A Level Physics Physical quantities and units, covering Physical quantities and S.I. units. Each one has a worked solution and a mark scheme showing where the marks go.