#### transgalactic

##### Banned

here is the problem and solution:

https://i26.tinypic.com/2vvm8vm.jpg

https://i31.tinypic.com/nqwq4n.jpg

i solved the 1st subquestion.

my problem starts with the second subquestion:

i understood how they got this expression

[latex]E=\frac{\epsilon_0}{\epsilon}E_0[/latex]

but i dont know what they do next

what law principle are they doing in the next 3 lines??

why the integral equals the expression that they show??

https://i26.tinypic.com/2vvm8vm.jpg

https://i31.tinypic.com/nqwq4n.jpg

i solved the 1st subquestion.

my problem starts with the second subquestion:

i understood how they got this expression

[latex]E=\frac{\epsilon_0}{\epsilon}E_0[/latex]

but i dont know what they do next

what law principle are they doing in the next 3 lines??

why the integral equals the expression that they show??

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