You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch. Draw a circuit diagram to represent the process.

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Solution

An electromagnet is a coil of current-carrying wire wound around an iron core as shown in the attached figure. When connected to a current source, the electromagnet becomes energised, creating a magnetic field just like a permanent magnet. The polarity of an electromagnet can be determined using right-hand thumb rule.

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