IP Physics Notes (Upper Secondary, Year 3-4): 16) Electromagnetic Induction

Q: What does IP Physics Notes (Upper Secondary, Year 3-4): 16) Electromagnetic Induction cover?
A: Apply Faraday and Lenz, sketch AC generator waveforms, and compute transformer ratios for power transmission questions.

Quick recap -- Changing magnetic flux induces emf. Remember: faster change -> larger emf, and the induced current always opposes the flux change (Lenz). Generators and transformers are direct applications.

Keep your practice loop tight via our IP Physics tuition hub-it links each topic here to quizzes, diagnostics, and WA-style problem sets.

Faraday's & Lenz's Laws

• Faraday: magnitude of induced emf $\mathcal{E}$ is proportional to rate of change of magnetic flux linkage.
• Lenz: induced current direction opposes the change producing it (conservation of energy).
• Practical consequences:
  • Move magnet faster -> larger $\mathcal{E}$.
  • Use stronger magnet or more coil turns -> larger $\mathcal{E}$.
  • No change in flux -> no induction.

Induction Setups

• Pushing/pulling magnet through coil.
• Moving a conductor across magnetic field lines.