Gauss' law:

$\overline{){{\mathbf{\varphi}}}_{{\mathbf{E}}}{\mathbf{=}}{\mathbf{\oint}}{\mathbf{E}}{\mathbf{\xb7}}{\mathbf{d}}{\mathbf{A}}{\mathbf{=}}\frac{{\mathbf{q}}_{\mathbf{e}\mathbf{n}\mathbf{c}}}{{\mathbf{\epsilon}}_{\mathbf{0}}}}$

**(a)**

q_{enclosed} = q_{1} + q_{2} + q_{3} = 3.5μC −1.5μC + 0 = +2.0 μC

In (Figure 1) , two objects, O_{1} and O_{2}, have charges +3.5μC and −1.5μC, respectively, and a third object, O_{3}, is electrically neutral.**(a)** What is the electric flux through the surface *A*_{1} that encloses all three objects?**(b)** What is the electric flux through the surface *A*_{2} that encloses the third object only?

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