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**Total energy of a dielectric sphere please help!!!!**

I have a problem that I can not do after searching the net and looking through my notes and text book. I think it is a basic electomagnetic field question but i just cant get my head around it.

The question is:

The electric field

__E__inside a dielectric sphere placed between the plates of a large parallel-plate capacitor is uniform. Given that the sphere has a relative dielectric constant "epsilon"(r) and radius r, find an expression for the total electric energy of the sphere.

I was considering using the relationship

U=1/2*"EPSILON(0)"E^2

Where U is the energy density and "EPSILON(0)" is the permitivity of free space and E is the electric field.

But I dont know how to take this to get an expression for the total energy of the dielectric.

Can anyone help me? I would really appreciate it

Thanks

hhh79bigo