Difference between revisions of "Electrodynamics/Tutorials/4/1/3"
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Latest revision as of 12:04, 26 September 2012
Video Intro
Hi, this is Jonathan Gardner.
We're covering [section reference] of Griffiths Introduction to Electrodynamics.
I'm going to move fast, but you can always rewind.
Thumbs up and share if you appreciate my effort.
As always, questions in a video response or comments.
Let's get started.
4.1.3 Polarization(?)
Polar Molecules
Some molecules have a dipole moment already added. Water (H20) has a very strong dipole moment, when no electric field is present.
Torque
What happens when they are placed in an electric field? There is a force one way on the positive, and the other way on the negative. This creates a torque.
If the field is mostly uniform where the molecule is, then there is no net force, so the molecule isn't going to move one way or the other.
Force
In a non-constant electric field, the force on one may be stronger than the other, creating a net force. This could cause the molecule to move one way or the other, depending on its dipole moment.
