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 ofk=3.60. the resultant electric field in the dielectric is1.20 \times 10^{6} volts per meter.
a) compute the magnitude of the charge per unit areasigma on the conducting plate.
b) compute the magnitude of the charge per unit areasigma_1 on the surfaces of the dielectric.
c) find the total electric-field energy u stored in the capacitor.