I am not sure whether this is the correct section to post in but here it goes...(adsbygoogle = window.adsbygoogle || []).push({});

I am really confused as to why the textbook has a "d" in denominator and why their integral is different from mine...I used the integral in 2nd column 2nd row but the textbook is different :S im not sure why difference in y (I used difference in L to represent the L's segment..) approaches Dy as the textbook states...Anyhow lets break the question into one main problem...I dont understand in the last few textbook lines why my integral is different from theirs even though I used the common integrals from appendix and also, how they got a d in denominator..

I solved question on my own then looked at textbook's answer.

http://img7.imageshack.us/img7/2696/integralsd.png [Broken]

http://img834.imageshack.us/img834/5516/qsanspg1.jpg [Broken]

http://img560.imageshack.us/img560/8483/qsanspg2.jpg [Broken]

http://img195.imageshack.us/img195/525/qspg1.png [Broken]

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# Electric field of a rod

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