Question

A cubical Gaussian surface surrounds three positive charges, each has a charge q1 = +4.00 × 10-12 C, and two negative charges, each has a charge q2 = −2.30 × 10-12 C as the drawing shows. What is the electric flux passing through the surface?(The permittivity of free space ε0 = 8.85×10-12C²/(N.m²))
add the charges.

flux= net charge/permitivity

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