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Limits of integration for electric potential

  1. Oct 22, 2015 #1
    In the example in the picture, we can see that they chose the limits of integration to be from 0 to R_0. Why didn't they choose x (that is, from 0 to x)? Isn't that what we normally integrate over when we find potential energy and electric fields?
    Thank you Screenshot (55).png
     
  2. jcsd
  3. Oct 22, 2015 #2

    mukundpa

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    Here we are adding potential at P due to different ring elements. The disk is considered as large numbers of thin rings with radii varying from 0 to R0 hence the potential due to a ring element is integrated for radius 0 to R0.
     
  4. Oct 22, 2015 #3
    That makes sense... so integrating from 0 to x would be invalid?
     
  5. Oct 22, 2015 #4

    mukundpa

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    Yes, actually integration is the sum and we are here adding nothing which is varying with x. The distance x of P is a constant.
     
  6. Oct 22, 2015 #5
    Ok thank you. I understand now
     
  7. Oct 22, 2015 #6

    mukundpa

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    welcome.
     
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