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Making measurements and analysing data

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Question 3
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A student determines the resistivity ρ \rho\,ρ of a uniform metal wire by measuring its resistance RRR, diameter ddd, and length LLL. The measurements and their absolute uncertainties are:

R=8.0±0.2 Ω R = 8.0 \pm 0.2\ \Omega R=8.0±0.2 Ω d=0.40±0.01 mm d = 0.40 \pm 0.01\text{ mm} d=0.40±0.01 mm L=2.00±0.01 m L = 2.00 \pm 0.01\text{ m} L=2.00±0.01 m

What is the percentage uncertainty in the calculated resistivity of the wire?

A

5.5%5.5\%5.5%

B

8.0%8.0\%8.0%

C

10.5%10.5\%10.5%

D

4.3%4.3\%4.3%

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.

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