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Physical quantities and units

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Question 14

Resistivity, ρ\rhoρ, is a material property defined by the relationship:

ρ=RAL \rho = \frac{R A}{L} ρ=LRA​

where R R\,R is the electrical resistance, A A\,A is the cross-sectional area, and L L\,L is the length of the conductor.

What is the correct representation of the S.I. base units for resistivity?

A

kg m3 s−3 A−2\text{kg}\,\text{m}^3\,\text{s}^{-3}\,\text{A}^{-2}kgm3s−3A−2

B

kg m2 s−3 A−2\text{kg}\,\text{m}^2\,\text{s}^{-3}\,\text{A}^{-2}kgm2s−3A−2

C

kg m3 s−2 A−2\text{kg}\,\text{m}^3\,\text{s}^{-2}\,\text{A}^{-2}kgm3s−2A−2

D

kg m2 s−3 A−1\text{kg}\,\text{m}^2\,\text{s}^{-3}\,\text{A}^{-1}kgm2s−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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