On removing $$2.9 \times 10^{19} $$ electrons from a metal sheet,then the charge on metal sheet is
Correct option is C. $$+5 C$$
Given:
$$n=2.9\times 10^{19}$$ electrons
$$e=1.6\times 10^{-19}C$$
Since the electrons are being removed hence the metal sheet is gaining
positive charge.
Total charge $$=2.9\times 1.6\times 10^{19-19}C$$
$$=+4.64C$$
or $$\boxed{+5C\,\, \text{approx}}$$
Option $$C$$