Electric Field inside and outside of Dielectric sphere

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Homework Statement



A dielectric sphere of radius R has a uniform permanent polarisation P. Determine the electric field both inside and outside the sphere. (Hint: Since div P = 0 everywhere, the electrostatic potential satisfies Laplace's equation. Do not assume that the sphere is characterised by a dielectric constant. Instead, use D = [tex]\epsilon_{0}[/tex]E0 + P.)

Homework Equations



use the laplace equation where the general form of potential is:
[tex]V=\Sigma (A_{l}r^{l}P_{l}(cos(theta))+B_{l}*1/(r_{l+1})*P_{l}(cos(theta)))[/tex]

The Attempt at a Solution



set the boundary condition when outside of sphere :
r ->infinity, V->0 hence Al=0

when inside the sphere
r-> 0, V not= infinity hence Bl=0

the next time is to find both the coefficients, a.k.a Al and Bl. so far am i heading the right directions?


my question is also what D = [tex]\epsilon_{0}[/tex]E0 + P purpose here in solving this problem?
 
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