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7.2 The motor effect

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Question 15

During a quality-control test of a magnetic sorting unit, a conductor is at right angles to a magnetic field. The field strength stays constant. The conductor initially carries a current of 2.0 A, and 0.04 m of it is inside the field. Possible settings use currents of 2.0 A, 3.0 A or 4.0 A and lengths of 0.04 m or 0.08 m inside the field.

Which setting would produce a force three times as large as the initial force?

[1]
A

A current of 3.0 A and a length of 0.08 m inside the field

B

A current of 2.0 A and a length of 0.08 m inside the field

C

A current of 3.0 A and a length of 0.04 m inside the field

D

A current of 4.0 A and a length of 0.08 m inside the field

Markscheme

7.2 The motor effect Questions

  1. GCSE
  2. /Physics
  3. /7.2 The motor effect

90 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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