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Asked in GSEB Board March 2022 · Applications and conceptual
Idea: Faraday's law states that the magnitude of the induced emf equals the time rate of change of magnetic flux through the circuit: |ε| = |(dΦ)/(dt)| (multiplied by N for N turns).
It tells how large the emf is, but not which way it drives the current.
The direction comes from Lenz's law: the induced current opposes the change of flux that causes it. That is the minus sign in ε = -(dΦ)/(dt).
So Faraday's law gives only the magnitude of the induced emf.
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