Lenz’s Law and Conservation of Energy (HSC SSCE Physics): Flashcards

Opposes the change in flux that induced it

Creates field in opposite direction

Creates field in same direction

Required by energy conservation

Induced emf opposing supplied emf

$I = \frac{\text{emf}_{sup} - \text{emf}_{back}}{R}$

Large (back emf is small)

Speed up → back emf up → current down

Loops of current induced in metal

Eddy currents create fields opposing motion