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4.5 Electromagnetic effects

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Question 144

A simple DC motor consists of a rectangular current-carrying coil suspended in a magnetic field between two permanent magnetic poles.

Which of the following modifications will increase the turning effect (torque) acting on the coil?

A

Using a stronger permanent magnet to increase the magnetic field strength.

B

Adding a resistor in series with the power supply to decrease the current.

C

Reducing the number of turns in the coil.

D

Decreasing the cross-sectional area of the coil.

Markscheme

4.5 Electromagnetic effects Questions

  1. IGCSE
  2. /Physics
  3. /4.5 Electromagnetic effects

275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.

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