upper limit in integration

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

  1. nithin

    Thread Starter Member

    Aug 27, 2004
    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
    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.