3 ms·

So you could say that all point masses (e.g. electrons) are black holes? What happens if you take a large black hole, and you throw a lot of electrons into it?

by jules 15y ago

So you could say that all point masses (e.g. electrons) are black holes? What happens if you take a large black hole, and you throw a lot of electrons into it? Does it get an electric field measurable from the outside? If not, how come an electron does have this field?

lutorm 15y ago
An electron is only a point mass in classical electrodynamics, which leads to all kinds of inconsistencies (the self-energy of its field would be infinite, for example.) In quantum mechanics, there is no such thing as a point mass. But in any case, the answer to your question is yes. Black holes have 3 quantities: mass, angular momentum, and charge. So, yeah, you can charge up a black hole by dropping charges into it and the charge would be visible to the outside.