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Changing magnetic flux passes through a coil. What happens to induced voltage if you double the turns?

It doubles; each turn adds its own induced voltage (Faraday's law).

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  1. It doubles ✔
  2. It stays the same
  3. It halves

Why: Faraday's law says induced emf equals the number of turns times how fast the magnetic flux changes. Twice the turns, twice the voltage, for the same changing field.

Huh, didn't know that: Spinning the magnet faster also raises the voltage, because the flux changes faster.

The dad joke
I wound my coil twice as much and doubled my voltage. Turns out it was worth it.
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References

Answer: It doubles. Faraday's law says induced emf equals the number of turns times how fast the magnetic flux changes. Twice the turns, twice the voltage, for the same changing field.

  1. OpenStax College Physics 2e, 23.2 Faraday's Law of Induction: Lenz's Law openstax.org/books/college-physics-2e/pages/23-2-faradays-law-of-induction-lenzs-law
    an emf will be produced that is N times greater than for a single coil.
    Checked 2026-10-10.

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