While detecting the magnetic field around a bar magnet, how do iron filings arrange themselves?

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Solution

The explanation for the question is:
Iron filings are magnetic materials. They experience magnetic force when kept near a bar magnet.
The force thus exerted makes iron filings to arrange in a pattern.
The region surrounding a magnet, in which the force of the magnet can be detected, is said to have a magnetic field.
The lines along which the iron filings align themselves represent magnetic field lines.

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