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## Homework Statement

Upload Problem 2.3 and I uploaded the question in a reply below

## Homework Equations

D/2ε

E=KQ/R^2

E=E1+E2+E3

## The Attempt at a Solution

I would upload my work but I am in a location where I cant right now but I can type what I did hopefully it will be clear enough. When r is outside of the sphere E=KQ/r^2 and when r is inside the sphere E=KQr/a^3. Well when r=1 it is inside and when r=2 it is inside but however at r=3 it is outside I assume then to solve the problem I need to set D/2ε=KQ/r^2 or some combination of this to get it correct, however because the equation adds the "a" term. Which is shown in the problem but is not given I dont know what to do?

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