The electric charge on an $\alpha$-particle is ....... .

How many electrons are there in $1 \ C$ of charge?

While doing his experiment,Millikan one day observed the following charges on a single drop:
$(i)$ $6.563 \times 10^{-19} \ C$
$(ii)$ $8.204 \times 10^{-19} \ C$
$(iii)$ $11.50 \times 10^{-19} \ C$
$(iv)$ $13.13 \times 10^{-19} \ C$
$(v)$ $16.48 \times 10^{-19} \ C$
$(vi)$ $18.09 \times 10^{-19} \ C$
From this data,the value of the elementary charge $(e)$ was found to be:

What is electrostatic induction?

When ${10^{19}}$ electrons are removed from a neutral metal plate,the electric charge on it is

How does a simple paper electroscope work?