Electric field of a disk & u-substitution

  • #1

Homework Statement


Calculate the electric field at point P (refer to visual):
Capture.JPG


Homework Equations


I follow everything - except how the limits of integration for the u-integral (
Capture1.JPG
) are arrived at?

The Attempt at a Solution


u=x2 is the smallest value u can have, and u=x2+R2 is the greatest value u can have?
 

Answers and Replies

  • #2
TSny
Homework Helper
Gold Member
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The lower limit of the u integration should correspond to the lower limit of the r integration (r = 0). So, the lower limit of the u integration is the value of u when r = 0. Similarly for the upper limit.
 
  • #3
Very helpful - thank you!
 

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