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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?


The lightbulb glows with much brighter and constant intensity.


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


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


The lightbulb will never glow.

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