Two reason s for using a soft iron bar in an electromagnet
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1) The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing.
2) Soft iron is used because it loses its magnetism as soon as the current stops flowing
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very easy. One is to increase the magnetic field of the current carrying solenoid and other reason is to Increase the magnetic strength of the solenoid..... I hope this will be helpful to you......
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