Plates in capacitors lie in planes z = 0 and z = a. In the range 0 < z < 1/2 there is a dielectric with a dielectric con

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Plates in capacitors lie in planes z = 0 and z = a. In the range
0 < z < 1/2 there is a dielectric with a dielectric constant
epsilon_1 and in the range 1/2a < z < 1 is another
material with a dielectric constant epsilon_2 . Outside the
capacitor is vacuum. The plates have an area A and charge Q in z=a
and -Q in z=0.
i) Find the fields D and E and
all the bound charges in the capacitor.
ii) What is the capacity of capacitor?