testing

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1).Certain materials when placed inside strong magnetic field gets magnetized and behave like a magnet. when a rod of soft iron is placed inside a solenoid and current is passed, the soft iron rod gets
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But if rod is made of hard steels, chromium steel or cobalt and tungsten steel then even if current is made zero, the material retains its magnetism, i.e., it becomes a magnet
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A solenoid with soft iron core is called an .

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