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4.5.5 The d.c. motor

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Question 16

An engineer is trying to increase the maximum turning effect (torque) of a d.c. motor. Three modifications are proposed:

  1. Use a coil with a larger cross-sectional area.
  2. Insert a soft iron core inside the coil.
  3. Connect the motor to a power supply with a lower voltage.

Which of these modifications will help to increase the turning effect?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Markscheme

4.5.5 The d.c. motor Questions

  1. IGCSE
  2. /Physics
  3. /4.5.5 The d.c. motor

31 exam-style questions on CIE IGCSE Physics 4.5.5 The d.c. motor. Each one has a worked solution and a mark scheme showing where the marks go.

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