Question

How many excess protons are in a positively charged object with a charge of +398 mC (millicoulombs)?

Answer 1

`2.49xx10^18`

Explanation:

The charge on 1 proton is `+1.6xx10^(-19)"C"`

So the no. of protons that carry `398"mC"` of charge is:

`(398xx10^(-3))/(1.6xx10^(-19))=2.49xx10^18`