# Uniformly polarized disk on a conducting plane.

## Homework Statement

A uniformly polarized dielectric disk surrounded by air is lying at a conducting plane, as shown in Fig. 2.36. The polarization vector in the disk is, $$\vec{P} = P\hat{k},$$ the disk radius is a, and the thickness d. Calculate the electric field intensity vector along disk axis normal to the conducting plane (z-axis).

## The Attempt at a Solution

See figure attached.

I can follow the solution up until the point where they add the two fields due to the 2 discs.

Which portion is E1 and which portion is E2?

Could someone please show all the steps they skipped?

Thanks again!

#### Attachments

• Q2.2.JPG
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