Question
Using the circuit for an electric bell,
a) Explain why the bell won't work if the elctromagnet is replaced with a permanent magnet. (2 marks)
b)Explain why the core of the electromagnet used in an electric bell must not be made from steel. (3 marks)
a) Explain why the bell won't work if the elctromagnet is replaced with a permanent magnet. (2 marks)
b)Explain why the core of the electromagnet used in an electric bell must not be made from steel. (3 marks)