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What is an electromagnet ? Draw a circuitdiagram to show how a soft-iron piece can be transformed into an electromagnet . |
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Answer» Solution :An electromagnet is a magnet in which a magnetic field is produced by an electric current. Itgenerally consists of a core made of magnetic material surrounded by a coil through which an electriccurrent is PASSED to magnetise the core. A soft-iron piece can be transformed intoan electromagnet by winding insulated COPPER WIRE AROUND it [to form a solenoid] and connecting the two ends of the wire to a battery as shown in the figure. The soft-iron piece behaves as a powerful magnetwhen a current is passed through the solenoid. When the current is switched off, the iron core loses its magnetism and ceases to be an electromagnet . Thus, electromagnets are temporarymagnets. 
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