how can you make an electromagnet??
mention two uses of an electromagnet??
for class 7th
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The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
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Electromagnets are made when they come in contact with an electrical circuit
2 uses are: 1) they can be turned on and off 2) their magnetic field can be increased or decreased.
Explanation:
I must say this topic isn't best for 7th class maybe try 10 or 11th
You should also know: to increase their magnetic strength: add more turns to the coils or increase the current
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