1. The problem statement, all variables and given/known data A parallel-plate air capacitor is made by using two plates 18 cm square, spaced 3.5 mm apart. It is connected to a 3-V battery. What is the capacitance? 2. Relevant equations C = εo(A/d) 3. The attempt at a solution εo = 8.854e-12 A = .18 m d = .0035 m C = εo (.18/.0035) = 4.55348571e-10 F This is coming up as the wrong answer. I have no idea what I'm doing wrong.