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i got a ring a small part of that ring is dq

then the whole ring is q

but i cant get this result in the integral

[tex]

\int_{0}^{2\pi}dq=2\pi-0=2\pi

[/tex]

i should get the result "q"

then the whole ring is q

but i cant get this result in the integral

[tex]

\int_{0}^{2\pi}dq=2\pi-0=2\pi

[/tex]

i should get the result "q"

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