Question

When you walk across a carpet during the winter you often get a shock when you touch a metal door knob. The reason is that you pick up electrons via friction between your feet and the carpet. If you pick up -10.98 microC of charge, how many electrons did you acquire ?

Answer 1

We have,

Q= ne;

Here,

Q= total charge;

n= number of electrons;

e = charge of one electron;

Using above formula

`\begin{gathered} Q=\text{ ne;} \\ 10.98\text{ }*10^{-6\text{ }}\text{ = n }*1.6*10^(-19)\begin{cases}Q={10.98*10^(-6)\text{ C}} \\ e={1.6*10^(-19)C}\end{cases} \\ \therefore n=\text{ }(10.98*10^(-6))/(1.6*10^(-19))=\text{ 6.8625}*10^(13) \end{gathered}`

Note:

`1\text{ microC= 10}^(-6)C`
`\text{ Answer is }6.8625*10^(13)\text{ ;}`