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Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 32

9702Practical circuits

The diagram shows a simple circuit. Which statement is correct?

  1. AWhen switch S is closed, the e.m.f. of the battery falls because work is done against the internal resistance of the battery.
  2. BWhen switch S is closed, the e.m.f. of the battery falls because work is done against the resistance of R.
  3. CWhen switch S is closed, the potential difference across the battery falls because work is done against the internal resistance of the battery.
  4. DWhen switch S is closed, the potential difference across the battery falls because work is done against the resistance of R.

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Correct answer: C. When switch S is closed, the potential difference across the battery falls because work is done against the internal resistance of the battery.

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