E & M: Review Part Deux

VERSION # 1.00

Last Updated 3:37 PM 2/20/2019

Write down EACH of the permutations of formlae and such that are related to electric potential (AKA electric potential difference, potential difference, V, change in voltage)






ANSWER: (No Peeking!)

  • Vb - Va = ∆V
  • U=qV
  • W = qV = -UE
  • V = keqi/ri (between some point in space and each charged particle present in that region of space)
  • V = ∫kedq/r

YIIIKKEEEESSSSS... but Mr W, my brain is gonna implode!

Mine too.... flash cards, quizzing your comrades etc etc... gotta do it!

Let's take a gander at example 25.1 (that's pretty straight forward)

Now let's take a looksee at example 25.2

On the few days that we actually had class (so to speak!) there was some question about what the heck a *Uniform* electric field might be.

Our impression was that "uniform" means that the electric field has the same value at each point on the efield line:

It turns out that if we have two charged plates with equal but opposite charged surfaces, that the efield lines between them are, to a fairly high degree, uniform (if you are curious, check out example 23.9 and especially the bottom of example 24.5 to see that the Efield between two equally charged plates is σo. Notice the Efield is position independent.

That means a trusty dusty test particle dropped in to our Uniform Efield at various points shown will experience the same electric field.

See example 25.1... that is a bit more predictable.

If your brain still hurts then just keep in mind that there IS such a thing as a Uniform electric field between two equally charged plates.


Ok... enough of that... let's see if we can tie in a bunch of what we've talked about so far.

Problem 25.19 is helpful here... Do That!