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April 27, 2015

Homework Help: physics

Posted by anonymous on Saturday, March 12, 2011 at 10:15am.

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)

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