If more field lines leave a closed surface than enter that surface, then
A. a net positive charge is contained inside the surface.
B. a net negative charge is contained inside the surface.
C. an error has been made since the number of field lines entering a surface must equal those leaving the surface.
D. an operating electron gun is inside the surface.
E. there must be a charge on the surface.
A. a net positive charge is contained inside the surface.
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