(Solved): A 12-volt battery is attached to two parallel metal plates. The dimensions of each plate are 20cm ...

A 12-volt battery is attached to two parallel metal plates. The dimensions of each plate are $20\mathrm{cm}$ by $40\mathrm{cm}$. The plates are separated by a piece of glass, with dielectric constant $?=11.3$, which has thickness $3.19\mathrm{mm}$. The plates have equal but opposite charges $\pm \mathrm{Q}$; calculate the value of $\mathrm{Q}$. (in C)