Question

A sphere is charged with electrons to

Answer 1

Answer:

$4.38\cdot 10^{13}$ electrons

Explanation:

The net charge on the sphere is equal to:

$Q=-7\cdot 10^{-6}C$

This charge is made up of N electrons. Each electron carries a charge of

$q=-1.6\cdot 10^{-19}C$

So the total charge is just the number of electrons times the charge of each electron:

$Q=Nq$

And solving the equation for N, we find the number of electrons:

$N=\frac{Q}{q}=\frac{-7\cdot 10^{-6}C}{-1.6\cdot 10^{-19} C}=4.38\cdot 10^{13}$