Explanation :
Capacitance of a capacitor,
Potential across the plates,
We know that the capacitance of a capacitor is given by :
We have to find the number of electrons.
since, q = ne (Charge is quantised)
n is the number of electrons.
So, ne = CV
or
So, the no. of electrons need to be on the negatively charged plate is .
Hence, this is the required solution.