Is Equation 2.49 Necessary for Griffith's Problem 3.19?

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Homework Statement


Please stop reading this unless you have Griffiths E and M book.
Are we supposed to use equation 2.49 to do this? Isn't that only true for conductors? If not, how do you do the problem without using equation 2.49?

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The Attempt at a Solution

 
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Eqn. 3.83 and 3.84 are a better bet
 
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