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Physical quantities and units

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Question 6
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Electrical resistivity, ρ\rhoρ, is a material property defined by the equation:

ρ=RAL \rho = \frac{RA}{L} ρ=LRA​

where R R\,R is the electrical resistance of a specimen of the material, A A\,A is its cross-sectional area, and L L\,L is its length.

What is the correct representation of the SI base units for electrical resistivity?

A

kg m2s−3A−2\text{kg m}^2 \text{s}^{-3} \text{A}^{-2}kg m2s−3A−2

B

kg m3s−2A−2\text{kg m}^3 \text{s}^{-2} \text{A}^{-2}kg m3s−2A−2

C

kg m3s−3A−2\text{kg m}^3 \text{s}^{-3} \text{A}^{-2}kg m3s−3A−2

D

kg m2s−3A−1\text{kg m}^2 \text{s}^{-3} \text{A}^{-1}kg m2s−3A−1

Markscheme

Physical quantities and units Questions

  1. A Level
  2. /Physics
  3. /Physical quantities and units

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.

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