Two oppositely charged but otherwise identical conductingplates of area 2.50 square centimeters are separated by adielectric 1.80 millimeters thick, with a dielectric constant of K=3.60. The resultant electric field in the dielectric is 1.20 * 10^{6} volts per meter. a) Compute the magnitude of the charge per unit area σ on the conducting plate.
b) Compute the magnitude of the charge per unit area σ1 on the surfaces of the dielectric.
c) Find the total electric-field energy U stored in the capacitor.