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Created for Albert.io. Copyright 2017. All right reserved.

A large electromagnetic transformer that is used for classroom demonstrations involves two coils of wire wrapped around opposite sides of a solid iron core. When the primary coil, with terminals A and B, is connected to a $9\text{ V}$ AC power source, the lightbulb in the secondary other coil seems to glow with constant brightness.

If terminals A and B were instead connected to a $9 \text{ V}$ battery, which of the following best describes the change in the lightbulb's behavior?

A

The lightbulb glows with much brighter and constant intensity.

B

The lightbulb at first glows bright, but then slowly fades until it is not glowing at all.

C

The lightbulb flashes bright at the instant the terminals are connected, but then does not glow at all.

D

The lightbulb will never glow.

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