Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points in the $+y$ direction and has a magnitude that depends only on $y$. For which of the following gaussian surfaces would it be easiest to calculate the net flux of the electric field?
A) A cubical surface oriented so that two opposite faces are perpendicular to the $y$ axis.
B) A spherical surface.
C) A cylindrical can-like surface oriented with its central axis perpendicular to the $y$ axis.
D) A cylindrical can-like surface oriented with its central axis parallel to the $y$ axis.
E) A cone-like surface oriented with its central axis parallel to the $y$ axis.

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The Answer of Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points in the $+y$ direction and has a magnitude that depends only on $y$. For which of the following gaussian surfaces would it be easiest to calculate the net flux of the electric field?
A) A cubical surface oriented so that two opposite faces are perpendicular to the $y$ axis.
B) A spherical surface.
C) A cylindrical can-like surface oriented with its central axis perpendicular to the $y$ axis.
D) A cylindrical can-like surface oriented with its central axis parallel to the $y$ axis.
E) A cone-like surface oriented with its central axis parallel to the $y$ axis.

Suppose That a Symmetry Argument of Some Kind Tells Us +y+y+y

Suppose That a Symmetry Argument of Some Kind Tells Us $+y$