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How is the magnetic field, B, related to Magnetization, M?

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How is the magnetic field, B, related to Magnetization, M?

(a) B ∝ M

(b) B ∝ 1/M

(c) B ∝ M^2

(d) B ∝ 1/M^2

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This question is from Parameters topic in chapter Magnetic Properties of Materials of Engineering Physics II

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Correct option is (a) B ∝ M

The explanation: The Magnetic Field, B, is directly proportional to the Magnetization, M, of the material. The true expression is: B = μ0M.

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