Ask yourself these simple questions:
1) What charge has an electron?.
2) Won't a beam of electrons have the same charge a single one?.
3) What do like charges do?.
Hi there,
I would like to add a few other questions to that list here...
4) What is the difference between two charges close to each other, from when they are at rest compared to when they are in motion?
5) What kind of field is produced when a charge moves through space?
6) What happens when a charge moving through space encounters a magnetic field?
Philosophy can be phun (chuckle). The one that i always liked was as follows...
"The barber shaves everyone in the village who does not shave himself".
Sounds reasonable, doesnt it? If someone does not shave them self then the barber must shave them. But then we can ask the little question:
"Then who shaves the barber?"
If the barber shaves himself then he is one of those people who shave them self and so the barber does not shave himself, but the barber does shave himself, so...
Even more interesting is what exactly is a hole? (think of a hole in the ground)