# The potential difference between two parallel plates is $10^4\;volts$. If the plates are separated by 0.5 cm, the force on an electron between the plates is :

$\begin {array} {1 1} (1)\;32 \times 10^{-13} N & \quad (2)\;0.32 \times 10^{-13} N \\ (3)\;0.032 \times 10^{-13} N & \quad (4)\;3.2 \times 10^{-13} N \end {array}$

$(4)\;3.2 \times 10^{-13} N$