A long conducting cylindrical rod is inside a long conducting enclosure with a s

Question

A long conducting cylindrical rod is inside a long conducting enclosure with a square cross-section.
The rod is maintained at a potential of +5000 volts with respect to the square which is grounded (V=0). The contour lines are equipotentials at V = +4000, +3000, +2000, and +1000 volts.

The image can be seen here:
http://s1148.photobucket.com/albums/o575/sarahjoy1216/?action=view&current=Screenshot2012-06-19at120723PM.png

Calculate the work which would be required to move a charge Q = -65.9 nC from '7' to '1'.

Explanation / Answer

1.318*10^(-4) W

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