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Physics (AS & A Level) · May / June 2016 · Paper 11 · Question 37

9702Practical circuits

A voltmeter is used to monitor the operation of an electric motor. The motor speed is controlled by a variable resistor. A fixed resistor is used to limit the speed. The current in the motor is gradually changed. In which circuit is the voltmeter reading proportional to the current in the motor?

  1. Acircuit A
  2. Bcircuit B
  3. Ccircuit C
  4. Dcircuit D

As printed in the paper

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Correct answer: B. circuit B

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