Question

A sphere has a net charge of -4.8 x 10^-17C. How many excess electrons are there on the sphere?

Answer 1

A sphere has a net charge of

$q=-4.8\times10^{-17}\text{ C}$

We have to find the number of excess electrons on the sphere.

By using the quantization of the charge as follows.

$q=ne$

Here, n is the number of excess electrons in the sphere.

And e is the charge of the electron calculated as

$e\text{ = 1.6}\times10^{-19}\text{ C}$

Now, the number of the excess electron in the sphere.

$\begin{gathered} n=\frac{q}{e} \\ n=\frac{-4.8\times10^{-17}\text{ C}}{1.6\times10^{-19}\text{ C}} \\ n=300 \end{gathered}$

So, there are 300 excess electrons on the sphere.