1. The problem statement, all variables and given/known data

find the field produced by a uniformly charged sheet carrying 87 pC/m2

2. Relevant equations

$\oint \vec{E}.d\vec{A}$ = qenclosed/$\epsilon$

3. The attempt at a solution

$\Phi$= $\sigma$A/$\epsilon$
$\Phi$=$\oint E.dA$ = ## E(2A) ##

2EA= $\sigma$A/$\epsilon$
E = $\sigma$/(2$\epsilon$) = 4.92 N/C where I use 8.85*10-12 for $\epsilon$ (this has been the value used through the book)
However the book says the answer is 49 kN/C
could someone point out my error? Thanks.

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