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Three spherical shells (red, green, and blue) are located on the screen.  You can only see the part of the sphere that is in the plane of the page.  A test charge is also shown that measures the electric field at that point (position is given in meters and electric field strength is given in newtons/coulomb).  Calculate the flux through each spherical shell.  You can click-drag on the test charge to change its position.  Restart.
 

Problem authored by Mario Belloni and modified by Anne J. Cox.
© 2004 by Prentice-Hall, Inc. A Pearson Company