Could millions of electrons condensed cut through things?

Question

i was going over in my head how to make a lightsaber and this popped in.. if you made a magnetic field to contain it and then looped them back, it could power itself maybe... im not sure :)

Answer 1

if you make enough, they could cut through the black hole

Answer 2

they would repel each other too much

Answer 3

There are commercial electron beam welders available for purchase today.  If you can use a stream of electroncs to weld two pieces of metal together, you can cut through metal as well.

Answer 4

If you have an electron beam with enough current the self magnetic field can overwhelm the electrostatic repulsion and it can propagate without exploding outwards. It would require an extremely bizarre magnetic field geometry in order to loop back on itself, most likely this would result in streaming instabilities which would cause the beam to breakup.

Nothing can power itself, that wouldnt conserve energy.

Answer 5

There are many, many things wrong with this.  It's ridiculous to even begin a serious response.

The short answer is no, on all counts.

Above all else, hitting something with electrons would simply give it a negative charge.  That's the only thing that would happen -- the electrons would transfer to whatever you hit.  It would not cut anything.