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7.2 The motor effect

7.2 The motor effect

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Question 6

A delicate copper suspension wire within a high-precision seismic galvanometer experiences a magnetic force due to a nearby permanent magnet assembly.

The details of this setup are as follows:

  • Magnetic force on the wire, F=7.2×10−5 NF = 7.2 \times 10^{-5}\text{ N}F=7.2×10−5 N
  • Magnetic flux density, B=120 mTB = 120\text{ mT}B=120 mT
  • Current in the wire, I=4.0 mAI = 4.0\text{ mA}I=4.0 mA
a.

Calculate the length, lll, of the suspension wire that is within the magnetic field. Show your working and state the unit.

[4]
b.

State one assumption made regarding the relationship between the wire and the magnetic field to perform this calculation.

[1]
Markscheme

7.2 The motor effect Questions

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

13 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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