Difference between soft iron and hard iron ?
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In soft iron, the domains return to being randomly aligned when the field is removed. Hard iron is used in permanent magnets. To make a permanent magnet, a piece of hard iron is placed in a magnetic field. ... An electromagnet, in contrast, uses soft iron; this allows the field to be turned on and off.
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Hard iron is an iron which retains their magnetism and is difficult to magnetize. Soft iron is iron that is easily magnetized and demagnetized with a small change of magnetic field.
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