A permanent magnet cannot be used in the electric bell.Why?
Answers
Answer:
No we can not use permanent magnets in radio and electric bells , because permanent magnets loose their property after some time whereas we can change the properties of electromagnet. No they will loose their properties.
A permanent magnet cannot be used in electric bell, because -
- The electric bell's hammer is attracted towards the bell's main body by continuous on and off sequence of the electromagnet attached in the bell's hammer.
This off and on sequence makes the continuous ringing possible.
- If we use the permanent magnet the hammer will be permanently attached with the bell's body and the detachment will not happen for the next ring of the bell.
- Also,the permanent magnet looses it's power over passing time and that's why it's not suitable for long lasting equipments.