In a region of space the electric field is in the x ‐direction and proportional to x, i.e., 
Consider an imaginary cubical volume of edge a with its edges parallel to the axes of coordinates. The charge inside this volume will be
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Field at face 
Flux over the face 
The negative sign arises as the field is directed into the cube
. 
Field at face 
Flux over the face 
Flux over the other four faces is zero as the field is parallel to the surfaces.
Total flux over the cube 
where q is the total charge under the cube
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