upper limit in integration

Discussion in 'Physics' started by nithin, Sep 15, 2004.

  1. nithin

    Thread Starter Member

    Aug 27, 2004
    15
    0
    hey .. this mite be an incredibly stupid question.. but its been buggin me for a long long time....

    lets say i need to integrate an expression from zero to a very large value( say 2 times greater than the earths radius)... so do i need to integrate it upto infinity or is it enough if i integrate it upto tat big value!!!!

    thanks ...
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    143
    Not knowing exactly what you are integrating, it is a general rule that if you have a finite limit, then you should integrate to that limit. Integrating to infinity should only be generally done when one requires a "total sum" of the function, for example when calculating total field strengths in electro-magnetics, as opposed to calculating field strength between physical limits.
     
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