A disk magnet has no markings. Which poles does it have?
The rod that failed the monopole test, positive charge at one end and negative charge at the other, still needs a name. Sources like it, carrying two opposite types bound together in one object, get one.
Here is a bar magnet: a north pole and a south pole, bound together in one object.
The bar magnet is a dipole: two opposite poles, one object. And the rod with positive charge at one end and negative charge at the other is also a dipole: two opposite types, bound together.
Idris says a horseshoe magnet, with its north and south poles, is a dipole. Is Idris correct?
But a sphere carrying only positive charge is not a dipole, because it carries one type, not two.
The 'bound together' part matters: two separate charged spheres across a room are two sources, not one dipole.
A student says two separate spheres, one positive and one negative, sitting on opposite sides of a room count as one dipole. Is the student correct?
A compass needle has a north pole at one end and a south pole at the other. Is the needle a dipole?
The needle carries two opposite poles, bound together in one object.
A source with two opposite poles bound together is a dipole.
The needle is a dipole.
A field source carries two opposite poles bound together. Type the name for this kind of source.
Which source is a dipole?
A magnetized paper clip, with a north and a south pole, is classified as a dipole. Which feature decides the classification?
The 'di' in dipole tells you what about a source?