Two particles that have a charge of the same sign - that is, either two positive particles, or two negative particles.
Another electron. Or anything else that has a negative charge.
Sort of... Except that the particles can both repel one another, and attract one another. If they just repelled one another, all matter would blow apart very quickly - or to be more precise, it wouldn't have gathered together in the first place.
Like charges repel one another.
"Opposites attract". So two electrons repel each other.
The electron particles in cathode rays have a negative charge. So if a plate is positively charged, it would attract the cathode rays, and if it was negatively charged, it would repel the rays.
The electron particles in cathode rays have a negative charge. So if a plate is positively charged, it would attract the cathode rays, and if it was negatively charged, it would repel the rays.
They possess negative charges and in the universe anything having same charge would repel eachother.
Particles cannot be filtered from colloids. A colloid is distinguished from a solution and a suspension by the particles because they usually have an electric charge, and they repel each other, so they do not collect into larger particles that would settle out like those in solutions, and suspensions.
The object would have a negative charge if it has more negative particles than positive particles. This is because the excess negative particles result in an overall negative charge.
The object would have a negative charge. Negative particles, such as electrons, carry a negative charge when they outnumber the positive particles, such as protons.
Two electrically charged items that repel eachother, must both have the same type of charge. Either both have a negative charge, or both have a positive charge. Hence the reason the are repeling one another. If one was negative and the other was positive they would both stick together because of the attraction.
"Like" magnetic poles repel one another. "Unlike" poles attract one another. In other words, a North pole and a North pole would repel while a North pole and a South pole would be attracted.