Disconnect a small-voltage battery from a coil of many loops of wire and a large voltage may be produced by
A)the sudden collapse in the magnetic field.
B)latent energy in the battery.
C)the resistance of the battery to a change in polarity.
D)electrons already in the wire.
E)the electric field between the battery terminals.

Question

Quizplus · Accepted Answer

When a battery is connected to a coil of many loops of wire, it creates a magnetic field as current flows through the coil. However, when the battery is suddenly disconnected, the magnetic field collapses, and this change in magnetic field induces a voltage in the coil due to Faraday's law of electromagnetic induction. This induced voltage can be much larger than the original voltage of the battery.

Disconnect a Small-Voltage Battery from a Coil of Many Loops