Magnetic field intensity is defined as

Magnetic moment per unit volume

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Magnetic induction force acting on a unit magnetic pole

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Number of lines of force crossing per unit area

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Number of lines of force crossing per unit volume

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Solution

The correct option is B Magnetic induction force acting on a unit magnetic pole
Number of lines of force passing through per unit area normally is intensity of magnetic field, hence option (c) is incorrect. The correct option is (b).

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