What happens when someone lets go of the button on an electric doorbell? the electromagnet gets stronger. the circuit is broken and the electromagnet turns off. the current moving through the circuit changes direction. the metal striker hits the bell.

Option (b) is the correct answer.

Explanation:

When the switch of a circuit is turned on then the circuit gets complete as a result current easily passes through the circuit. Similarly, when switch of a circuit is turned off then the circuit gets open or incomplete as a result flow of current stops.  

Thus, we can conclude that when someone lets go of the button on an electric doorbell then the circuit is broken and the electromagnet turns off.

um i think it might be a car?