A negatively charged balloon has 4.5 µC of
charge.
How many excess electrons are on this balloon?
Answer in units of electrons
To find the number of excess electrons on the balloon, we need to know the charge of a single electron. This is given by the elementary charge, which is approximately 1.6 x 10^-19 Coulombs (C).
Now, we can use the equation Q = ne, where Q is the total charge in Coulombs, n is the number of excess electrons, and e is the elementary charge.
Given that the balloon has a charge of 4.5 µC, which is equivalent to 4.5 x 10^-6 C, we can set up the equation as follows:
4.5 x 10^-6 C = n * 1.6 x 10^-19 C
To solve for n, we can isolate it by dividing both sides of the equation by 1.6 x 10^-19 C.
n = (4.5 x 10^-6 C) / (1.6 x 10^-19 C)
Evaluating this expression, we find:
n ≈ 2.8125 x 10^13 electrons
Therefore, the balloon has approximately 2.8125 x 10^13 excess electrons.