The diagram shows the set-up for an electric door bell. Which best explain why the bell would not ring in this set up? A. The circuit is open. B. The electromagnet has an iron core. C. The circuit is closed. D. The electromagnet is made of steel.

The correct answer is:
A. The circuit is open.
The bell would not ring in this set-up because the circuit is open.
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The circuit is open. Thus option A is correct.
An open circuit is one in which the passage of electricity has been disrupted by a break in the path.
You complete an electrical circuit when you press a doorbell button, allowing household electricity to flow through the doorbell's inbuilt electromagnet. The electromagnet's magnetic field is then employed to power a device that produces the doorbell sound.
If that circuit will get open as shown in the image then the bell would not ring in this case.
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