Question

Why do magnetic field of lines passes through iron rather than air?

Answer 1

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Due to flow of current there is a magnetic field generated, and hence there are magnetic lines of force. So the lines of force prefer to pass through iron than air.

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Answer 2

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Iron offers little resistance to current compared to air. Due to flow of current there is a magnetic field generated, and hence there are magnetic lines of force. So the lines of force prefer to pass through iron than air...