Figure 20-17 shows two coils wound around an iron ring,...

Figure 20-17 shows two coils wound around an iron ring, which directs the magnetic field of each coil around the ring. Current appears in the coil on the right A. the moment the battery is connected by closing the switch. B. the entire time the battery is connected with the switch closed. C. the moment the battery is disconnected by opening the switch. D. the moment the battery is connected by closing the switch and the moment the battery is disconnected by opening the switch. E. the entire time the battery is disconnected with the switch open.

Figure 20-17 shows two coils wound around an iron ring, which directs the magnetic field of each coil around the ring. Current appears in the coil on the right
A. the moment the battery is connected by closing the switch.
B. the entire time the battery is connected with the switch closed.
C. the moment the battery is disconnected by opening the switch.
D. the moment the battery is connected by closing the switch and the moment the battery is disconnected by opening the switch.
E. the entire time the battery is disconnected with the switch open.

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Key Concepts

Faraday's Law of Induction

Faraday's law quantitatively relates the induced EMF to the rate of change of magnetic flux through a circuit. It establishes that a rapid change in the magnetic field, such as when a circuit is switched on or off, produces a significant induced current, emphasizing that induction occurs during transient (non-steady) conditions.

Electromagnetic Induction

This concept explains how changing magnetic fields can induce an electromotive force (EMF) in a conductor. It is fundamental to understanding how devices like transformers, generators, and inductors operate, as the induced voltage arises only when there is a change in the magnetic flux through the coil.

Mutual Induction

Mutual induction occurs when a change in current in one coil induces an EMF in another coil that is in proximity to it, due to the shared magnetic field. This principle is the basis of transformer operation, where energy is transferred between coils via magnetic coupling.

Transient Response in Inductive Circuits

This concept focuses on the behavior of circuits when there is a sudden change, such as switching events. In inductive elements, the induced current appears only during moments of changing current (switching on or off), rather than during steady state conditions, due to the reliance on the rate of change of magnetic flux.

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