Millikan's Oil Drop Experiment - A Level Physics

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Millikan used this apparatus to measure the fundamental charge on an electron in the early twentieth century - see how he could measure such a small value using relatively straight forward lab equipment.
Thanks for watching,
Lewis
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[@VyvienneEaux]

I prefer this explanation over others online because you nicely defined variables and set up an equation to crystallize the concept for us.

[@sea5205]

Really well explained video!

[@baraskparas9559]

Congratulations on an excellent, logical presentation.

[@KnowledgeScroll]

Great Video !!!...This derivation was insane but that's what I like about physics. :)

[@PhysicsOnline]

+CXC Tutor Each step is quite simple and logical, and often uses equations we're all familiar with, but the end result can look amazingly complicated. I'm just trying to show that even these weird looking formula aren't always as bad as they first seem.

[@KnowledgeScroll]

+A Level Physics Online and you did an excellent job.

[@PhysicsOnline]

Thanks - I'm going to make a few more famous experiments in Lego form soon.

[@Hans-pc1vc]

The best explanation on UA-cam. Thank you!

[@Xd_Froze]

Thank you

[@eshaanmalasi3539]

your Lego explanations help me visualise the experiment perfectly

[@leonardowilhelmdicaprio999]

You cleared every bloody thing up!!!!

[@dhruvgoel9848]

It's actually amazing how you used legos to help us visualise the experiment.

[@atonomousunknown4285]

Went from here to there but understood each step. the legos were really helpful plus Great quality vids..

[@Ghost____Rider]

I actually enjoyed this video, thanks!

[@subashrawat5660]

Lifesaver damn....

[@ImeneBellahdid-cf9gd]

Wooow I like it thank you so much 😍😍😍😍

[@RayxaxD]

You made much easier to understand the experiment! Thank you!

[@tau6511]

U owe my life.... xD saved me from spot test

[@sharonsunil978]

thank you so much..

[@edwinthompson7402]

brilliantly explained

[@fouzal3badi898]

thank you very much, bless you

[@top10foryou84]

can we use this method to overcome gravity and create an effect of zero gravity
i mean by knowin th wieght of person we produce + charge equal to its weight and it will float like zero gravity

[@triggeredboyz7142]

Thanks a lot sir!!
Lego made me learn easily!!

[@PhysicsOnline]

This is a difficult topic. So hopefully this makes it a bit easier!

[@triggeredboyz7142]

@@PhysicsOnline yes sir it helped me, as a student!!
👏👏👏👏🙏🙏
I'm your fan from now; I've shared your video!!

[@feranmiodelotan7151]

I'm confused. I just watched another video which says that as the oil drops came down, they lost electrons making them become positively charged. And that the top plate was negative. So the positively charged electron was attracted to the negatively charged top plate. I would appreciate if I can get an explanation for this

[@lucksterduck]

I think you meant "oil drop" instead of "electron" in your second to last sentence. As for your question, I wonder if the discrepancy has to do with the fact that Millikan observed the chamber through an eyepiece, which would have inverted everything from his point of view. This would mean that the bottom plate was in fact negatively charged, only that it appeared to be the top plate as viewed through the eyepiece.

[@feranmiodelotan7151]

@@lucksterduck Thanks for this. But which explanation do you think would be generally accepted?
Exam-wise and all

[@commodorekitty]

Thanks! 💖

[@ebunoluwaojo9356]

great video! But does the drag force affect the oil droplet when it is stationary

[@wahajqamar5456]

no , beacuse it will only be stationary due to the PD. so when it is stationary the weight is equal to the electric field. So no drag involved .

[@rushvi1611]

thank you for this video:) I am still confused about the forces on the oil droplet. If there's drag & gravity, and the droplet reaches terminal velocity (so resultant force = 0), then can we consider the weight acting on it with the Coloumb force?

[@joshuaft1]

Legendary sir

[@rehnumaislamruhana7804]

Very helpful

[@anirsan]

Is this important for CIE A levels?

[@jasperfirth8933]

Great video, but I would have liked to know why he was getting answers which were multiples of 1.60 instead of just 1.60 flat out

[@koko10900]

Its because 1.6 x 10^-19 C is the charge of a single electron ( The smallest quanta of charge). The oil droplets would consist of ionised atoms so some would give values of exactly the elementary charge but others would give larger multiples as more than one electron will have been removed. Thus it would provide multiples of the elementary charge rather than a single electrons charge.

[@yasminstone3151]

i dont understand from 6:37 onwards. Please help!

[@darwinianchimp2630]

How has life come to be without that explanation?

[@koko10900]

Paper 3 tomorrow everyone! Good luck!

[@kaivanshah4304]

why was the oil drop in equilibrium

[@capt.heinrich6945]

the voltage used is just right so that the negatively charged oil drop cannot fall since it is attracted by the positively charged top plate, as well as being repelled by the negatively charged bottom plate

[@kaivanshah4304]

@@capt.heinrich6945 thank you

[@capt.heinrich6945]

@@kaivanshah4304 no problem

[@DopeAK7]

@@capt.heinrich6945 so mg = EQ?

[@FrazzleFlib]

9:44 L

[@justxela5282]

So true!! 🤭

[@mbaziiramark3508]

Hi

[@babischatzis5620]

these things must be explained without equations... to me

[@Scrupee]

Zafir you here? 😪