Four point charges Q1, Q2 , Q3 , Q4 are in space. S is a closed surface. E is the magnitude of the electric field at an arbitrary point on surface S and denotes the electric flux through S. If the charge Q1 is moved from point a to point b along the dashed line, which of the following statements is true? A、Both E and FE change. B、Both E and FE do not change. C、E changes but FE does not change. D、E does not change but FE changes.
denotes the electric flux through S. If the charge Q1 is moved from point a to point b along the dashed line, which of the following statements is true?