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प्रश्न
State the purpose of soft iron core used in making an electromagnet.
लघु उत्तरीय
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उत्तर
On placing a soft iron rod in a solenoid and passing a current, the magnetism of the solenoid is increased by a thousandfold. When the solenoid current is switched off, the magnetism is effectively switched off since the soft iron core has a low retentivity.
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