What happens when the button of an electric bell is kept pressed for 20 seconds?
Bell B1 rang multiple times.
Bell B2 rang only once.
What can be said about the bells based on these observations?
An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar.
What will happen when the switches of both the bell and the pump are pressed?
When we pass electricity through the coil, it produces magnetic field around the soft iron piece and this soft iron piece becomes electromagnet and its magnetic strength can be changed by changing the amount of current flowing the coil. Electromagnets have various uses in the industry. It can be used to separate magnetic material from non-magnetic material as it will attract all the magnetic material, thus leaving behind all the non- magnetic material. When we press the button for electric bell outside anyone's house, what happens? You hear a sound but that sound remains only till you press the button as soon as you remove your finger, the sound stops.
The mechanism which explains the bell out of the following is?