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

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

=11.6022x10-19C2.5x10-16C
=1.560x103C
=1560C