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NSW HSC · Physics

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Q22 · Electromagnetic induction3 marks

A bar magnet is pushed into a coil connected to a galvanometer, held still inside it, then pulled out. Explain the galvanometer reading in each stage.

  1. Moving in: the flux through the coil increases, so an emf is induced✓ 1
  2. Changing flux, induced emf
  3. Held still: the magnet is inside, so the needle stays deflected0 / 1
  4. Marker: No change in flux means no emf: the reading falls back to zero.
  5. Pulled out: the flux decreases, so the current reverses (Lenz)✓ 1
  6. Opposite change, opposite deflection
2 / 3Mark to win back: a steady field read as an induced current

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