- #1

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http://i42.tinypic.com/9j2alv.gif

the charge on one small ring is

[tex]

dq=\frac{Qdx}{h}\\

[/tex]

the problem is with the distance squared part

its constantly changes

i don't know how to write in the distance square part

??

[tex]

E=\frac{kQ }{h} \int_{h+d}^{d}d x

[/tex]

and it a ring not a small particle

so the normal formula of a field kq/r^2

is not logical here