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Materials having good retentivity are?

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Materials having good retentivity are?

(a) Strong magnets

(b) Weak magnets

(c) Temporary magnets

(d) Permanent magnets

The question was asked in semester exam.

My question is taken from Magnetomotive Force and Magnetic Field Strength in chapter Simple Magnetic Circuits of Basic Electrical Engineering

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Correct answer is (d) Permanent magnets

For explanation: Materials with good retentivity are permanent magnets because they can retain magnetism even when no external magnetic field present.

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