Question

When the switch of an electric bell is pushed:
A) Flow of current stops through the electromagnet of the cell
B) Current starts to flow through the electromagnet
C) Voltage decreases in the current flowing through the electromagnet
D) Circuit is closed in the electric bell.

Answer 1

Hint: In order to arrive at the correct answer to this particular question we just have to use proper reasoning. We know that an electric bell rings only when the switch is pressed, we can use this approach at the right answer to this question.

Complete step by step answer:
An electric bell is an electric appliance that works on the principle of electromagnetic induction. When the switch of an electric bell is pushed then current starts flowing through the circuit and thus the circuit is closed. The flow of current starts in the electromagnet and due to electromagnetic induction, it starts to act like a magnet. The hammer which is made of metal is attracted by the electromagnet and thus a ringing sound is produced. As soon as the hammer hits the bell, the circuit becomes open and the flow of current through the electromagnet of the electric bell stops.

As a result of which the hammer returns to its original position and the flow of current starts again because of the circuit being closed. This process continues till the switch is pressed.

Thus, the correct answer to this question is (B) current starts to flow in the electromagnet.

Note: This problem can also be solved by eliminating the incorrect options. We know that when we switch on an electric bell the flow of current does not stop in the electromagnet. The voltage also does not decrease upon pressing the switch. This means that on pressing the switch, electric current starts to flow in the electromagnet of the electric bell.