I keep getting “Faraday's law of induction” questions wrong in Magnetism & Electromagnetic Induction. What's the trap?
expecting a steady (unchanging) magnetic field to induce an EMF.
The usual trap: expecting a steady (unchanging) magnetic field to induce an EMF. How to avoid it: only a CHANGE in flux — move the magnet or change the area/field — induces current. Go back to the definition — a changing magnetic flux induces an EMF, EMF = −dΦ/dt.
Key point
Faraday's law of induction
Common mistake
expecting a steady (unchanging) magnetic field to induce an EMF.
Memory tip
only a CHANGE in flux — move the magnet or change the area/field — induces current.
Tap to watch or see it right here — the app stays open (it only opens a quick search if nothing embeddable is found).