Why do scientists add infinity to things like bringing a charge from infinity, putting something on infinity, making an image on infinity when it’s just a concept and doesn’t actually exist.

Question

And also get mad at it because it came in their equation so it must hat some sort of mistake.

In: Physics

Answer 1

It tests that the maths is reasonable. In the limit the formula generally blows up or tends to zero as one parameter tends to infinity, and this should make sense. If it blows up when you would expect it to tend to zero then something in your formula is upside-down.