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12.3 The motor effect

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Question 12

A loudspeaker uses the motor effect to move its cone. At one instant, the current in the loudspeaker coil is 0.35 A.

For each turn of the coil, only a 32 mm length of conductor is inside a magnetic field of flux density 0.40 T0.40\ \mathrm{T}0.40 T. This length is at right angles to the field. The forces on these lengths act in the same direction and add together.

The coil must provide a total force of at least 0.50 N.

Calculate the minimum number of turns needed in the coil.

[4]
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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