When studying crystal structures, it is sometimes convenient to model them asrectangular grids of charged ions, this problem forms the starting point for such a model. a) (2 points) imagine a small square (sidea) with four point charges +q, one on eachcorner. calculate the total stored energy of this system (i. e. the amount of workrequired to assemble it).b) (2 points) then, calculate how much work it takes to "neutralize" these charges bybringing in one more point charge (−4q) from far away and placing it right at thecenter of this square.