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Making measurements and analysing data

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Question 2

The resistivity ρ \rho\,ρ of a wire of local material can be determined using the expression ρ=πRd24L\displaystyle \rho = \frac{\pi R d^2}{4 L}ρ=4LπRd2​, where R R\,R is the resistance, d d\,d is the diameter of the wire, and L L\,L is the length of the wire.

Here is some data:

QuantityPercentage uncertainty
RRR2.4%
ddd1.5%
LLL0.8%

What is the percentage uncertainty in the calculated value of ρ\rhoρ?

A

4.7%

B

5.5%

C

6.2%

D

7.7%

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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