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Homework Statement
An elecret is a dielectric that has a quasi-permanent polarization when there is no applied field. Consider a uniformly polarized cylindrical electret. The cylinder has a radius of 10h and a length h. The polarization is Pk where k is a unit vector along the axis.
a. Draw the electric field lines.
b. Calculate the electric field at the center of the cylinder. Ignore edge effects.
c. Calculate the electric field on the midplane of the cylinder at a distance
100h from the center. The approximation of a point dipole can be used since the distance is very large.
Homework Equations
The Attempt at a Solution
I need help with pretty much all of this problem. I am unsure of which formulas to use, as well as drawing the field lines. Would the field lines just be from the bottom of the cylinder to the top of it? Thanks.