C 10.9 A sphere with its center in the coordinate origin and with radius a is homo- geneously…

C 10.9 A sphere with its center in the coordinate origin and with radius a is homo- geneously electrically polarised with polarisation P¯  = P zˆ.

 

 

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a.     Determine the electric field E¯ on the z axis inside and outside the sphere.

b.     Determine the electric displacement D¯ on the z axis inside and outside

the sphere.

c.     Give the continuity condition for the normal component of the displace- ment vector D¯ and verify that this is fulfilled in this case.

Hint: Utilize formula (8.31) and apply formulas (10.22) and (10.54).

d.     Show that ∇· D¯ = ρ f . Accordingly, the source of D¯ is free charge. Explain why D¯ is finite despite the fact that only a bound charge exists

in this case.

 

 

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