00:01
All right, so let's say we have the charge in a wire and a particular section of wire as a function of time that's given by 4t minus t squared.
00:11
And this charge is in coulums.
00:15
So we'll say, you know, in couloms or better yet, let's write it as four couloms per second times t minus one coulom per second square times t squared.
00:27
So part a asked, what is the current in the wire as a function? of time.
00:34
So this is just going to be the derivative of the charge.
00:38
And so this will be four.
00:40
And a koulon per second is just an ampere.
00:42
So we'll just put that four amperes minus two.
00:46
And then this is two amper second squared times t.
00:52
I'm sorry, for ampers per second times t...