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Math Help - integral mathematical part of physics question..

  1. #1
    MHF Contributor
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    integral mathematical part of physics question..

    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
    <br />
\int_{0}^{2\pi}dq=2\pi-0=2\pi<br />
    i should get the result "q"
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  2. #2
    Senior Member
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    Apr 2009
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    Atlanta, GA
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    408

    Definite

    This is a definite integral. In general, \int dx=x+C, so \int_0^{2\pi}dq=q|_0^{2\pi}=2\pi-0=2\pi
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