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12.3 The motor effect

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Question 36
H

A wire experiences a force F F\,F at right angles to a uniform magnetic field. The length in the field is doubled and the magnetic flux density is reduced to one-third of its original value. What must happen to the current to keep the force equal to FFF?

[1]
A

It must become 3.03.03.0 times its original value.

B

It must become 0.670.670.67 times its original value.

C

It must become 6.06.06.0 times its original value.

D

It must become 1.51.51.5 times its original value.

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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