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Question:

A certain particle carries 2.5 × 10⁻¹⁸ C of static electric charge. Calculate the number of electrons present in it.

Solution:

One electron has charge 1.602 × 10⁻¹⁹ C.
The number of electrons present in the charged particle is
2.5 × 10⁻¹⁸ / 1.602 × 10⁻¹⁹ = 1.56 × 10¹.
Thus, the number of electrons present in the charged particle is = 1.56 × 10¹.