The potential difference between two parallel plates is $10^4 \mathrm{~V}$. If the plates are separated by…
The potential difference between two parallel plates is $10^4 \mathrm{~V}$. If the plates are separated by $0.5 \mathrm{~cm}$, the force on an electron between the plates is
$32 \times 10^{-13} \mathrm{~N}$
$0.32 \times 10^{-13} \mathrm{~N}$
$0.032 \times 10^{-13} \mathrm{~N}$
$3.2 \times 10^{-13} \mathrm{~N}$
Solution
The force $F=\frac{e V}{d}$
$=\frac{1.6 \times 10^{-19} \times 10^4}{0.5 \times 10^{-2}}$
$=3.2 \times 10^{-13} \mathrm{~N}$