AdvertisementCaptivating slow motion footage shows millions of tiny iron fillings swirling and dancing around a large magnet after being thrown towards it in a series of arty tricks. The direction of magnetic field at a point is the direction of the resultant force acting on a hypothetical North Pole placed at that point. When current flows in a wire, a magnetic field is created around the wire. A magnetic field of a bar magnet thus results from the motion of negatively charged electrons in the magnet. One of the most common magnets - the bar magnet - is a long, rectangular bar of uniform cross-section that attracts pieces of ferrous objects.

Source: Daily Mail February 11, 2019 15:56 UTC