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Edexcel A-Level Physics Faraday’s and Lenz’s Laws

Practise Edexcel A-Level Physics Faraday’s and Lenz’s laws by calculating induced EMF and explaining opposition to flux changes.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
A2

Exam points

  • calculate induced EMF from flux-gradient graphs, coil turns and swept area
  • apply Lenz’s law to decide induced current direction, braking force or energy transfer
  • use motion-through-field ideas such as BLv to judge EMF across aircraft wings or rods

4.4.110 - Faraday’s and Lenz’s laws question 1

[Maximum number: 3]

A student carried out an investigation to compare the energy stored in a mechanical mouse trap with the energy stored in an electronic mouse trap.

The electronic mouse trap works by applying a large potential difference (p.d.) across two metal plates. The diagram shows part of the circuit for the electronic mouse trap.

Figure for Question 4.4.110 - Faraday’s and Lenz’s laws question 1 — Edexcel A-Level Physics A2

The graph shows how the magnetic flux density B in the iron core varies with time.

Figure for Question 4.4.110 - Faraday’s and Lenz’s laws question 1 — Edexcel A-Level Physics A2

Show that the maximum p.d. across the output coil is about 600 V .
number of turns on coil = 1700
cross-sectional area of coil =3.5×10−4 m2=3.5 \times 10^{-4} \mathrm{~m}^{2}

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