Please, can someone help me quickly with these two problems!!!!! 1. The problem statement, all variables and given/known data A parallel plate capacitor is constructed with a dielectric constant ( k = 3 * 10^8) The maximum projected voltage is 5000v and the capacitance needed is .5 micro Farads. Calculate the plate area. 2. Relevant equations Q =VC, C = AE/d, C = KC 3. The attempt at a solution Well, I can solve for Q, but that doesn't help. Also I don't know d!. Is 5 microfarads before or after the influence of the dielectric? Another one, please :) 1. The problem statement, all variables and given/known data Compute the capacitance on a cylindrical capacitor of length 5cm. This capacitor consists of two hollow concentric cylinders with radii of 1.5mm and 4mm (surface area of cylinder is 2pirl) 2. Relevant equations 2pirl, Q=VC 3. The attempt at a solution I don't know the cylinder equations!