The video explains the concepts of magnetic, electric, and gravitational fields using simple demonstrations. It shows how ...

Although we cannot see magnetic field lines, we can detect them using iron filings. The tiny pieces of iron line up in a magnetic field.

The iron filings in the image become induced magnets when they are near the bar magnet. They lose most or all of their magnetism when they are removed from the magnetic field.

This can be "seen" in two dimensions if iron filings are sprinkled on a sheet ... as this helped to concentrate the magnetic field.

Get Instant Summarized Text (Gist) Micrometer-sized, flower-shaped structures made of a nickel-iron alloy can locally enhance magnetic fields by concentrating field lines at their center. The ...