Q=-10C
me=9,11×10⁻³¹kg (masa de repaus a electronului)
N=6,242×10¹⁸ electroni (cantitatea de sarcina electrica echivalenta cu 1C)
Atunci numarul de electroni primiti de corp, Ne, este:
Ne=N×Q=10×6,242×10¹⁸=6,242×10¹⁷ electroni.
Masa corpului a crescut, dupa electrizare cu:
Δm=Ne×me=6,242×10¹⁷×9,11×10⁻³¹=56,864×10⁻¹⁴kg
Δm=56,86410⁻¹⁴kg=56,864×10⁻¹¹g=56,864×10⁻⁸mg=56,864×10⁻⁵μg
Δm=56,864×10⁻5μg=56,864×10⁻²ng=0,56864ng
