Question

The space between the plates of a parallel-plate capacitor, shown below, is filled with two slabs of different dielectric materials

 Problem 5

 The space between the plates of a parallel-plate capacitor, shown below, is filled with two slabs of different dielectric materials. The slab at the top has thickness 2d and a relative dielectric constant of er1 = 3 and the one at the bottom has thickness d and a relative dielectric constant of er2 = 2. The capacitor plates have surface area S.

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 a. Assume a total charge of +Q on the top plate and -Q on the bottom plate. Find electric flux density D in each slab using the boundary condition on the normal component of D.

 b. Find the electric field E in each slab

 c. Find the polarization P in each slab

 d. Find the potential difference between the plates in terms of Q, d, e0

 e. Find the surface charge density on both plates in terms of V, d, e0


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