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प्रश्न
Which magnetic properties are desirable for making a permanent magnet?
टिप्पणी लिखिए
उत्तर
A permanent magnet should require a very high reverse field to demagnetize, and it should have a substantial zero-field magnetization. Stated differently, it ought to possess an extremely wide hysteresis loop that possesses both high coercivity and high retentivity.
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