Question

1. A liquid drop has 20 excess electrons. Calculate the charge on the liquid drop.​

Answer 1

Answer:

The initial charge of protons and electrons balance each other therefore initial charge of drop is 0

but when 20 extra electrons are added it aquires a negative charge of following value

charge of 1 e =1.6*10^-19 C

therefore charge due to 20 e = 20 * 1.6*10^-19 C

= 3.2*10^-18 C