diagram of electric bell
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When an electric current flows through a wire - especially one in the form of a coil - it becomes an electromagnet. It is a temporary magnet, as it can retain its newly-gained characteristics only as long as the current flows through it. However, it shows all the properties of a permanent bar magnet, including the two opposite poles - N and S - during this period.
This very nature of electromagnets has made them indispensable to modern life: we can turn them on and off, as we wish whenever we want. The simple electric bell is a case in point.
Hope this helps you...
When an electric current flows through a wire - especially one in the form of a coil - it becomes an electromagnet. It is a temporary magnet, as it can retain its newly-gained characteristics only as long as the current flows through it. However, it shows all the properties of a permanent bar magnet, including the two opposite poles - N and S - during this period.
This very nature of electromagnets has made them indispensable to modern life: we can turn them on and off, as we wish whenever we want. The simple electric bell is a case in point.
Hope this helps you...
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