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1. Hugh D. Young, Roger A. Freedman, and A. Lewis Ford, University Physics with Modern Physics, 13th ed. ( Addison-Wesley, San Francisco, 2012), pp. 706707.
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17. T. S. van Kortryk, “ On the fields due to line segments,” e-print arXiv:1410.6832 [physics.hist-ph] (2014).

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A geometrical method to calculate the electric field due to a uniformly charged rod is presented. The result is surprisingly simple and elegant. Using only lengths and angles, the direction of the electric field at any point due to this charge configuration can be graphically determined. The method is not new but seems to have been all but forgotten. A full understanding of this result can lead to a deeper appreciation of symmetry in a seemingly un-symmetric system.


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