Lenz's Law & Induced EMF Direction
Test your grip on the direction of the induced current — the part of electromagnetic induction where the physics is easy and the sign is not.
Fourteen questions cover the minus sign in Faraday’s law, what happens when flux rises against when it falls, why an approaching magnet is repelled and a receding one attracted, motional EMF, eddy-current braking, and why a huge steady field induces nothing at all.
Built around the single most common error on this topic: opposing the flux instead of opposing its change.
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Sample questions3 of 14 shown
Q1
In Faraday's law written as EMF = −dΦ/dt, a student calls the minus sign "just a sign convention with no physics in it". What is the correct interpretation of that minus sign?
Q2
A student writes in an exam: "The induced current always flows so as to oppose the magnetic flux through the loop." What exactly is wrong with this statement?
Q3
The magnetic flux through a closed conducting loop is increasing. Inside the loop, the magnetic field produced by the induced current is directed:
What This Quiz Covers
- The minus sign in EMF = −dΦ/dt
- Opposing the change, not the flux
- Rising flux against falling flux
- Approaching and receding magnets
- Motional EMF = Bvl
- Eddy currents and magnetic braking
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