Question

An objrct gains 20 coulomb positive charge by losing electrons. How many electrons does the object lost?

Answer 1

The charge of electron as well as proton have charge which is eqaul in magnitude....

1electron have -1.6×10^-19C

if 20 coloumb of positive charge is gained by abject then ,it means it losses the charge of -20C

charge on one electron=-1.6×10^-19

electron having charge of 20C=-20C/(-1.6×10^-19)

=12.5×10^19

Hence the total no. of electron lost be object will be 125×10^18

{hope it helps}