Question

If your body develops a charge of -19 μC (microcoulombs), how many excess electrons has it acquired?

Answer 1

`1e \ \ \ \ \ \ \rightarrow \ \ \ \ \ \ -1,6*10^(-19)C\\ x \ \ \ \ \ \ \ \rightarrow \ \ \ \ \ \ -19*10^(-6)C\\\\ x = (-19*10^(-6)C*1e)/(-1,6*10^(-19)C)=11,875*10^(13)e=1,1875*10^(14)e`

Answer 2

Answer : The number of electrons it acquired is,
`11.875* 10^(13)` electrons

Solution : Given,

Total charge =
`-19\mu C=-19* 10^(-6)C`
`(1\mu C=10^(-6)C)`

Charge on one electron =
`-1.60* 10^(-19)C`

Formula used :

`\text{Number of electrons}=\frac{\text{Total charge}}{\text{Charge on one electron}}`

Now put all the given values in this formula, we get the number of electrons.

`\text{Number of electrons}=\frac{\text{Total charge}}{\text{Charge on one electron}}=(-19* 10^(-6)C)/(-1.60* 10^(-19)C)=11.875* 10^(13)electrons`

Therefore, the number of electrons it acquired is,
`11.875* 10^(13)` electrons.