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What is the energy density at r= 10.6cm , just outside the inner sphere?

What is the energy density at r = 15.4cm , just inside the outer sphere?

u = 1/2eoE^2 & E=V/d

**Basically i found E-field between the shells by using E=V/d where d was the difference in radii. Then subbed that into the Energy density one. Wrong**

I also tried to add radii then divide by 2 and use the given 10.6 cm value. Wrong and Wrong.

I also tried to add radii then divide by 2 and use the given 10.6 cm value. Wrong and Wrong.