How many excess electrons are on a ball with a charge of -4.00*10^-17 C?
I know that the charge per electron is 1.60 *10^-19C.
The Attempt at a Solution
My textbook does not explain how to do this, but I thought I would divide-->4.00*10^-17 C * 1 electron/-1.60*10^-19. I got -2.5*10^-36. The answer from the book is 2.5*10^2 electrons.
I did some messing around and did this-->4.00*10^-17C*1 e/1.60*10^19C=2.5*10^2 electrons.
What's the correct way to do this problem?
Thanks in advance.