Question

calculate the charge on a body if two billion electrons are added to it ?​

Answer 1

Answer:

It depends. Was the body electrically neutral before the addition? Or was it already charged?

What one can calculate is the difference between the charge on the body before and after the process.

The elementary charge, that is, the charge carried by a single electron, has a value of approximately −1.6×10−19 coulombs. Therefore, the charge of 2 billion electrons is:

Q=2×109×(−1.6)×10−19

Q=−3.2×10−10C

So, it’s correct to say that, after adding 2 billion electrons to the body, it will have a charge of Qo−3.2×10−10 coulombs, where Qo is the charge before the electrons were added.

If it were indeed electrically neutral at the start, it would have a charge of -0.32nC, less than a billionth of a coulomb. Just for comparisson, a simple, household battery, has a charge, in magnitude, of about 9000 coulombs (its electric current is really small, though)

2 billion electrons ain’t that much, eh?