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Physics (AS & A Level) · Oct / Nov 2019 · Paper 13 · Question 5

9702Errors and uncertainties

The power loss P in a resistor is calculated using the formula P = \frac{V^2}{R}. The percentage uncertainty in the potential difference V is 3% and the percentage uncertainty in the resistance R is 2%. What is the percentage uncertainty in P?

  1. A4%
  2. B7%
  3. C8%
  4. D11%

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Correct answer: C. 8%

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