4.1.3 Alignment of Polar Molecules

Molecules that have a dipole moment when not in the presence of an electric field will experience a torque in an electric field. If the electric field is not constant, they will experience a net force as well.
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Next: • 4.1.4 Polarization
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[@KodxQ8]

You made this video while I was in the 6th grade. And now I am Physics student and you’re saving me. WHAT AN ABSOLUTE LEGEND.

[@douglasstrother6584]

The dipole moment of water is 6.2*10^-30 C-m. Using the Ångstrom as the unit of length, and the electron as the unit of charge, one gets 0.39 electron-Å for the dipole moment. This gives a clearer sense of the magnitude of the charge separation in a molecule.

[@ANKITKUMAR-kc2zw]

The problem is that (you have to look closely)here we have grad of Electric field.And till now we have only studied gradient of scalars.Gradient of electric field gives tensor.Which most of us have not studied till now.So Griffiths has approximated it so that we have to not deal with tensors.

[@alendominic8320]

Now I understand.....I was really perplexed by the gradient of E.....Thanks a lot.

[@SamSarwat90]

You should be more prepared with your videos. Your mistakes may confuse peeple. Just commenting. Im thanksfull for your work :)

[@tejomaya4817]

Your lectures are really helping me a lot in understand the concepts.... I watch ur videos before reading textbook.. Thanks sir.. Lots of love 🇮🇳.

[@AaqibKhan335]

i don't understand how you did those last couple of steps . the ones in which gradients are involved. its not explained in the book as well

[@kailashkolluru2398]

its explained in the starting chapter of the textbook with the name fundamental theorem of calculus (1.3.2)
go through it bro!!

[@vatsaljingar6783]

Aaaa........why i doesn't get it early but now going on nice with my studies.....thank you so much sir

[@ndhyani29]

You don't have to use dE...use ∆E...and then use increment theorem of calculus where you have to put epsilon tends to zero (since dipole is small)...and you will get ∆E= (gradient E along x).d

[@jg394]

Good point.

[@ndhyani29]

@@jg394 thankyou☺️

[@amjadhussain-ei9jw]

I also

[@anishkesri2509]

we dont expect lyk ds frm some1 who teaches us!!.

[@user-si1zn3ir7x]

You are just reading griffiths textbook as my professor

[@jg394]

I am not a professor so I don't feel comfortable going "off-script". Your professor shouldn't be just reading the textbook either, he should be pointing out what is important for you to learn in your department. That said, Griffiths is truly one of the greatest textbooks ever written, and on the topic of EM, it is positively unthinkable for anyone to write a better book or come up with a better way of presenting this material. If we emulate the best, it's because we want the best.

[@JC-og4er]

@@jg394 get his ass