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12.3 The motor effect

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Question 14

In a linear positioning device, distances along a straight conducting bar are measured from one end. A uniform magnetic field covers the bar from the 6.0 cm mark to the 15.0 cm mark. The bar is perpendicular to the field and carries a current of 1.6 A. The magnetic flux density is 0.25 T0.25\ \mathrm{T}0.25 T. Use F=BIlF=BIlF=BIl. What is the magnetic force on the part of the bar in the field?

[1]
A

0.024 N0.024\ \mathrm{N}0.024 N

B

0.060 N0.060\ \mathrm{N}0.060 N

C

0.036 N0.036\ \mathrm{N}0.036 N

D

0.084 N0.084\ \mathrm{N}0.084 N

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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