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 $\displaystyle \int_{0}^{2\pi}dq=2\pi-0=2\pi $ i should get the result "q"
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This is a definite integral. In general, $\displaystyle \int dx=x+C$, so $\displaystyle \int_0^{2\pi}dq=q|_0^{2\pi}=2\pi-0=2\pi$
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