Please wait for the animation to completely load.

The bar graph displays the electric flux passing through the cylindrical flux detector (position is given in meters and flux is given in N·m²/C).  Drag the surface and observe the flux readings.  Rank the charges (lines of charge extending into and out of the screen) from most negative to most positive.  Restart.  

Note:  The Gaussian surface encloses two or three charges at a time.  It never partially encloses a line charge.

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