A surface is so constructed that,at all points on the surface,the vector points inward.Therefore,it can be said that
A)the surface encloses a net positive charge.
B)the surface encloses a net negative charge.
C)the surface encloses no net charge.
D)the surface vector $\Delta$S at all points on the surface is necessarily parallel to the electric field vector .
E)the surface vector $\Delta$S at all points on the surface is necessarily perpendicular to the electric field vector .

Question

A surface is so constructed that,at all points on the surface,the  vector points inward.Therefore,it can be said that
A)the surface encloses a net positive charge. 
B)the surface encloses a net negative charge. 
C)the surface encloses no net charge. 
D)the surface vector $\Delta$S at all points on the surface is necessarily parallel to the electric field vector . 
E)the surface vector $\Delta$S at all points on the surface is necessarily perpendicular to the electric field vector .

Quizplus · Accepted Answer

The inward-pointing electric field vector indicates that the surface encloses a net negative charge. This is because the electric field lines originate from positive charges and terminate on negative charges, and a surface that contains all of these lines must enclose a net negative charge.

A Surface Is So Constructed That,at All Points on the Surface,the