Describe what transpires in a conductor when the current changes directions or stops, or the magnetic field changes.
What will be an ideal response?
When the current changes direction or stops, or the magnetic field changes, an electromotive force (emf) is induced back into the conductor through the collapsing of the magnetic field. The opposition to the changes in current flow is identified as counter electromotive force (counter emf). This effect is summarized by Lenz's law-an induced emf in any circuit is always in a direction to oppose the effect that produced it. The amount of counter emf is in proportion to the rate of change. The faster the rate of change, the greater the counter emf.
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