- #1
agolkar
- 5
- 0
hi :) it's me again. This is my second question in a few days, w/o being able to help anyone else, hope to be not too much pretentious
my doubt this time regards the mathematical passage underneath the formula (23) of this speech:
http://scarface.ngi.it/elet.jpg
disregard the text part because i don't think it's helpful in an english forum it just introduces the electric field and its properties.
The fact is I cannot understand the derivation done from the E formula, i thought that the thing to do was just derivating r (that, considering an orthogonal system with the origin in the (x0,y0,z0) point, is (x^2+y^2+z^2)^1/2) because i had to consider the rest as costant so out of the derivation but it isn't it.. any help? thanks
alex
my doubt this time regards the mathematical passage underneath the formula (23) of this speech:
http://scarface.ngi.it/elet.jpg
disregard the text part because i don't think it's helpful in an english forum it just introduces the electric field and its properties.
The fact is I cannot understand the derivation done from the E formula, i thought that the thing to do was just derivating r (that, considering an orthogonal system with the origin in the (x0,y0,z0) point, is (x^2+y^2+z^2)^1/2) because i had to consider the rest as costant so out of the derivation but it isn't it.. any help? thanks
alex
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