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Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 36

9702Practical circuits

A cell is connected to a fixed resistor. Over a long period of time, the internal resistance of the cell increases. What is the effect of the increase in internal resistance on the electromotive force (e.m.f.) of the cell and on the power dissipated by the fixed resistor?

  1. Ae.m.f. decreases, power dissipated decreases
  2. Be.m.f. decreases, power dissipated no change
  3. Ce.m.f. no change, power dissipated decreases
  4. De.m.f. no change, power dissipated no change

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Correct answer: C. e.m.f. no change, power dissipated decreases

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