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A lightweight calibration rod in an aerospace geomagnetic simulation chamber experiences a magnetic force due to the uniform field produced by a set of Helmholtz coils.

The parameters of the system are recorded as:

  • Magnetic force on the rod, F=4.5×10−4 NF = 4.5 \times 10^{-4}\text{ N}F=4.5×10−4 N
  • Magnetic flux density of the chamber, B=750 μTB = 750\ \mu\text{T}B=750 μT
  • Calibration current passing through the rod, I=1.2 AI = 1.2\text{ A}I=1.2 A
a.

Calculate the active length, lll, of the rod within the magnetic field. Show your working and state the unit.

[3]
b.

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

[1]

The motor effect Questions

Practise AQA GCSE Physics The motor effect with exam-style questions for Foundation and Higher tier. 25 questions covering Electromagnetism, Fleming's left-hand rule (HT only), Electric motors (HT only), and Loudspeakers (physics only) (HT only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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The motor effect Questions

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