Skip to content

Course home

Sign up

Making measurements and analysing data

EasyMedium
12345678910
Question 10

A student measures the properties of a uniform constantan wire to determine its electrical resistivity, ρ\rhoρ. The measurements obtained are:

  • Resistance, R=12.5±0.2 ΩR = 12.5 \pm 0.2\ \OmegaR=12.5±0.2 Ω
  • Length, L=1.50±0.03 mL = 1.50 \pm 0.03\text{ m}L=1.50±0.03 m
  • Diameter, d=0.80±0.02 mmd = 0.80 \pm 0.02\text{ mm}d=0.80±0.02 mm

Using the formula ρ=πRd24L\displaystyle \rho = \frac{\pi R d^2}{4 L}ρ=4LπRd2​, what is the percentage uncertainty in the calculated value of the resistivity?

A

6.1%6.1\%6.1%

B

8.6%8.6\%8.6%

C

11.1%11.1\%11.1%

D

13.6%13.6\%13.6%

Markscheme

Making measurements and analysing data Questions

  1. A Level
  2. /Physics
  3. /Making measurements and analysing data

26 exam-style questions on OCR A A Level Physics Making measurements and analysing data, covering Measurements and uncertainties. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank