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**Two concentric metal spheres have radii [tex]r_1[/tex] = 10 cm and [tex]r_2[/tex] = 10.5 cm. The inner sphere has a charge of Q = 5 nC spread uniformly on its surface, and the outer sphere has charge -Q on its surface. (a) calculate the total energy stored in the electric field inside the spheres**

*Hint: You can treat the spheres essentially as parallel flat slabs separated by*0.5 cm*why?***[tex]\phi = 4\pi kQ[/tex]**

U=qV/2

U=qV/2

**First of all, I don't know why treating the spheres as slabs will help, but since that's the hint, I'm looking for a way to do it. I can show with Gauss' Law that teh electric field inside the inner sphere is 0, so that kind of makes them like slabs. Is that enough justification and why?**

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