The reason for sprinkling iron filings around these two magnets is to make it possible to see where the magnetic field lines are, therefore the correct option is C.
What is a magnetic field?
A magnetic field could be understood as an area around a magnet, magnetic material, or an electric charge in which magnetic force is exerted. The SI unit of the magnetic field is tesla.
The behavior of the magnetic material around the magnetic field is such that they align themselves in accordance with the path of the magnetic field lines, therefore, these iron filings are very handy for knowing the magnetic field line's path ad the poles of a bar magnet as well.
The reason for sprinkling iron filings around these two magnets is to make it possible to see where the magnetic field lines are, therefore the correct option is C.
Learn more about the magnetic fields from here
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