Question: Consider a closed surface that surrounds Q1 and Q2 but not Q3 or Q4. (a) Which charges contribute to the electric field at point P?

Consider a closed surface that surrounds Q1 and Q2 but not Q3 or Q4.
(a) Which charges contribute to the electric field at point P?
(b) Would the value obtained for the flux through the surface, calculated using only the electric field due to Q1 and Q2, be greater than, less than, or equal to that obtained using the total field?

Imaginary closed surface 24 03

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