This experiment conducted using iron filings helps us to understand imaginary Magnetic field lines and Magnetic Permeability.
Fig 1. The direction of magnetic field lines represented by the alignment of iron filings sprinkled on paper placed above a bar magnet.
Fig 2. The direction of magnetic field lines represented by the alignment of iron filings sprinkled on paper placed above two bar magnets when an iron bolt is kept in between them. It helps us to understand magnetic permeability.
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