A party streamer is rubbed on a carpet and carries charge. Does it have an electric field around it?
Field sources differ in a way you have seen but not yet named. A charged sphere can carry just one type of charge, and nothing else. That one-type kind of source gets its own name.
Count the types a source carries, and the name follows. Here is a metal sphere carrying only positive charge: one type of charge, nothing else.
The positive sphere is a monopole: it carries one type. And a ball carrying only negative charge is also a monopole: one type, nothing else.
A student says a bead carrying only negative charge is a monopole. Is the student correct?
But a sphere carrying positive charge on one side and negative charge on the other is not a monopole, because it carries two types.
One question decides every case: how many types does the source carry?
A cloud of charge is all negative, with nothing else in it. Is the cloud a monopole?
The cloud carries a single type of charge.
A source made of a single type is a monopole.
The cloud is a monopole.
Casper says a rod with positive charge at one end and negative charge at the other is a monopole. Is Casper correct?
A field source carries a single type of charge only. Type the name for this kind of source.
Which source is a monopole?
A sphere carrying only positive charge is called a monopole. What does the name say about the sphere?
The 'mono' in monopole tells you what about a source?