Which statement about magnetic poles is true?

Which statement about magnetic poles is true?

• A. A magnet has more than two poles
• B. A magnet always has exactly two poles
• C. A magnet has no poles
• D. A magnet's poles can disappear

Answer: (D)

Magnetic poles come in pairs and every magnet behaves like a dipole with a north end and a south end. Field lines exit from the north and loop around to enter the south. If you cut a magnet, each piece still becomes a magnet with its own north and south; you don’t end up with a single pole or “poles” that vanish. Magnetic monopoles (a single isolated pole) aren’t observed in ordinary magnets, so you don’t get more than two poles per magnet in that simple view. The only time you can say the poles disappear is when you demagnetize the material—remove its magnetic order so there’s no sustained external magnetic field. That’s different from poles simply vanishing while the material remains magnetized. So magnets inherently have two poles, and they don’t disappear under normal conditions.

Magnetic poles come in pairs and every magnet behaves like a dipole with a north end and a south end. Field lines exit from the north and loop around to enter the south. If you cut a magnet, each piece still becomes a magnet with its own north and south; you don’t end up with a single pole or “poles” that vanish. Magnetic monopoles (a single isolated pole) aren’t observed in ordinary magnets, so you don’t get more than two poles per magnet in that simple view.

The only time you can say the poles disappear is when you demagnetize the material—remove its magnetic order so there’s no sustained external magnetic field. That’s different from poles simply vanishing while the material remains magnetized. So magnets inherently have two poles, and they don’t disappear under normal conditions.