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Physics (AS & A Level) · May / June 2025 · Paper 13 · Question 37

9702Potential difference and power

An electrical device of fixed resistance 20 Ω is connected in series with a variable resistor and a battery of e.m.f. 16 V and negligible internal resistance. The power dissipated in the electrical device is 4.0 W. What is the resistance of the variable resistor?

  1. A16 Ω
  2. B36 Ω
  3. C44 Ω
  4. D64 Ω

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Correct answer: A. 16 Ω

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