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- When a closed surface doesn't enclose any source or drain, the total flux through the closed surface is Zero (positive, negative or zero). 4. A fluid flow with a source This looks like E field diagram generated by negative) change(s)? (how many) positive_(positive or 5. With a source and a sink If this vector field looks like the E field created by two point charges. The top charge is_ _(positive or negative) The bottom charge is (positive or negative) Which charge has a large magnitude _(top one, bottom one, or same magnitude.) (Hint: which one seems to have a stronger impact? Where does the field appear to zero?) 6. With two sources If this vector field looks like the E field created by two point charges. The top charge is (positive or negative) The bottom charge is _(positive or negative) Which charge has a large magnitude _(top one, bottom one, they are the same.) (Hint: which one seems to have a stronger impact? Where the field is close to zero?)