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12.3 The motor effect

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Question 1

A d.c. motor turns the paddle in a laboratory stirrer. A sensor records 72 reversals of the current in the motor coil during 3.0 s. The split-ring commutator reverses the current every half-turn.

How many revolutions per minute is the motor turning?

[1]
A

24 revolutions/min24\ \text{revolutions/min}24 revolutions/min

B

1440 revolutions/min1440\ \text{revolutions/min}1440 revolutions/min

C

720 revolutions/min720\ \text{revolutions/min}720 revolutions/min

D

36 revolutions/min36\ \text{revolutions/min}36 revolutions/min

Markscheme

12.3 The motor effect Questions

  1. GCSE
  2. /Physics
  3. /12.3 The motor effect

86 exam-style questions on Edexcel GCSE Physics 12.3 The motor effect, covering 12.3.1 The motor effect, 12.3.2 Fleming's left-hand rule, 12.3.3 Force on a conductor, and 12.3.4 Electric motors. Each one has a worked solution and a mark scheme showing where the marks go.

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