What Happens When You Cut a Bar Magnet in Half?

By Doug Leenhouts; Updated April 24, 2017
Cutting a magnet in half results in two dipole magnets.

It can be natural to think that cutting a bar magnet in half will separate the north and south poles, but this is not what happens. Instead, it creates two smaller dipole magnets.

Domains

Magnets have small pockets of material called domains. These domains have atoms whose magnetic moments are all aligned in one direction, not just with each other, but also with all of the other domains in the magnet. Arbitrarily, we call the directions the magnetic moments point toward "north" and "south."

Halving

When you cut a bar magnet into two pieces, the magnetic moments are still aligned as they originally were. In fact, this is the case for magnets of all shapes, including rings and horseshoes. If cut in two, they will still exhibit the properties of a standard dipole magnet.

Magnetic Monopoles

Physicists attempting to create a Grand Unified Theory of particle physics have predicted the existence of a magnetic monopole, which is a particle with one magnetic pole and a net magnetic charge. This particle has not yet been detected using modern methods, and is unlikely to be discovered by cutting a standard bar magnet in half.

About the Author

A professional travel writer since April 2010, Doug Leenhouts has written for world66.com and slowtrav.com. He has a Bachelor of Science in management information systems from the Worcester Polytechnic Institute and three years of service in a consulting firm.