Question

A certain particle carries 2.5 × 10–16 C of static electric charge. Calculate the number of electrons present in it.

Answer 1

Charge on one electron = $1.6022 × 10^{-19} C$
⇒ $1.6022 × 10^{-19}\ C$ charge is carried by 1 electron.
∴ Number of electrons carrying a charge of $2.5×10^{-16}\ C$
= $\frac {1}{1.6022×10^{-19} C}(2.5×10^{-16} C)$
= $1.560 × 10^3 \ C$
= $1560\ C$