Electric Field due to a Point Charge

hpayandah
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Homework Statement


Looking at the picture I have attached the problem is very straight forward. In the denominator of the equations I have posted the teacher uses 2\Pi but the book uses 4\Pi. Can someone please explain to me why is that.


Homework Equations


Book's equation:
attachment.php?attachmentid=59489&stc=1&d=1371058707.jpg

Teacher's Soln:
attachment.php?attachmentid=59490&d=1371058701.jpg


The Attempt at a Solution


Please refer to attached pictures.
 

Attachments

  • Screen Shot 2013-06-12 at 1.33.32 PM.jpg
    Screen Shot 2013-06-12 at 1.33.32 PM.jpg
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  • Screen Shot 2013-06-12 at 1.29.45 PM.jpg
    Screen Shot 2013-06-12 at 1.29.45 PM.jpg
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I was finally able to solve my problem. By the way from the two y points there is infinite line of charge in the z-axis. Here is my answer:
attachment.php?attachmentid=59492&stc=1&d=1371070711.jpg
 

Attachments

  • IMG_20130612_165511.jpg
    IMG_20130612_165511.jpg
    17.1 KB · Views: 544

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