1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Cant understand this transition

  1. Dec 13, 2009 #1

    how did they erased the derivative of I object

    how did they change the variable?
  2. jcsd
  3. Dec 13, 2009 #2
    Substitute P=Li.di/dt in the equation.. dt cancels out
  4. Dec 13, 2009 #3
    why they change t to I
    on the interval
  5. Dec 13, 2009 #4
    Because now we are integrating with respect to i as it goes from 0 to I. First, we were integrating with respect to t which was going from 0 to t. It means that as t goes from 0 to t, i goes from 0 to I and that i is dependent on t.

    i(t=0) = 0
    i(t=t) = I
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook