Excess electrons are placed on a small lead sphere of mass so that its net charge is

PHYSICS · Subjective · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

Excess electrons are placed on a small lead sphere of mass

6.90\,\text{g}

so that its net charge is

-3.20 \times 10^{-9}\,\text{C}

. Find the number of excess electrons (in terms of

\times 10^{10}

) on the sphere.