Aparallel-plate capacitor is constructed of two square plates, size l×l, separated by distance d. the plates are given charge ±q. let's consider how the electric field changes if one of these variables is changed while the others are held constant. part a what is the ratio e(final)/e(initial) of the final to initial electric field strengths if q is doubled?
Applying the law of gauss to two parallel plates with charge density equal σ:
So, if the charge is doubled the Electric field is doubled too