The equation ε = -dφ/dt represents the induced electromotive force (emf) in a circuit due to a change in magnetic flux over time. This relationship shows that the induced emf is proportional to the negative rate of change of the magnetic flux, which highlights how changing magnetic fields can generate electric currents. The negative sign reflects Lenz's law, indicating that the induced emf works in a direction to oppose the change that created it, connecting this concept to various phenomena in electromagnetism.
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