Why permanent magnets are made of steel while the core of the transformer is made of soft iron?
Answers
The core of an electromagnet must be of soft iron because soft iron loses all of its magnetism when current in the coil is switched off while steel does not loses its magnetism when there's no current in the conductor.
The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magnetism as soon as the current stops flowing. Soft iron is said to form a temporary magnet.
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An alternating current passes through the primary coil. The alternating current produces a magnetic field that continuously changes direction. The soft iron core increases the strength of the magnetic field.So the transforemer is made of soft iron core.
Retentivity of soft iron is greater than retentivity of steel
soft iron is more magnetised than steel loses its magnetism more rapidly than steel