A uniform electric field E = E0 j is set-up in a region of space. A frame is pla

Question

A uniform electric field E = E0 j is set-up in a region of space. A frame is placed in that region in
such a way that its plane is perpendicular to the y-axis. Which of the following changes would
decrease the magnitude of the electric flux through the frame?

A) sliding the frame sideways parallel to the x-axis within the xz-plane
B) Sliding the frame sideways parallel to the z-axis within the xz-plane
C) moving the frame vertically along the y-axis keeping parallel to the xz-plane
D) rotating the frame in the xz-plane with respect to the y-axis
E) tilting the frame so that its plane is now in the yz-plane

Explanation / Answer

E. tilting the frame.

Think of flux as light. The frame is like a window in the xz plane, and the light is shining in the y direction. Sliding sideways as in answer A or B don't change the amount of light that passes through the window, and neither does moving the window along the y axis (C) or rotating it.(D)

What does change the amount of light shining through the frame is tilting it (E).

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