Electroscope Experiment: Opposites Attract, Likes Repel

[nirmalpatel97]

if i had a penny for every pixel in this video i would have about a dollar

[JeffersonLab]

@nirmalpatel97 That's some odd math you have there.

[itsyourbirthday99]

this is really rong start at 0:17 the she says things whitch sound really rong

[JeffersonLab]

@itsyourbirthday99 Whaa?

[demz56]

why is that the plastic strip become negatively or positively charged by scraping the both plastic strip?

[JeffersonLab]

@demz56 The triboelectric series lists materials according to their ability to take electrons from other materials. When dry skin comes in contact with plastic, electrons are transferred to the plastic. So, both sheets of plastic become negatively changed since both sheets are being charged with the same material.

[demz56]

@JeffersonLab This is Charged by a contact?

[JeffersonLab]

@demz56 Different materials come into contact with each other and, when they are pulled apart, there is a transfer of charge.

[demz56]

@JeffersonLab ok.. i have a last question... the both plastic & hands are neutral? before scraping?

[JeffersonLab]

@demz56 Yes, everything originally starts off neutral.

[demz56]

@JeffersonLab and the hands have a ability to lose electrons ? because in the triboelectric series the dryskin is (+) right or wrong?? hehehe..

[JeffersonLab]

@demz56 Right.

[demz56]

@JeffersonLab Sir.. Tnx.. fo the Info. but i have a question.. why you conduct the experiment in middle winter?

what is in the weather if you conduct a experiment??

[JeffersonLab]

@demz56 It is very humid here in the summer, so it's difficult doing experiments with static electricity. It's much less humid here in the winter.

[demz56]

@JeffersonLab so... what is in the humid ? why you not conduct experiment if is too humid ?

[JeffersonLab]

@demz56 Humidity measures the amount of water vapor in the air. Since water is polar, it is attracted to charged objects. The more water vapor there is in the air, the faster charged objects lose their charge.

[demz56]

@JeffersonLab so.. the charged objects will going to attracted to the water? sorry for being a Curios :) i wanna learn.. from the people who can explain me very well..

[JeffersonLab]

@demz56 We actually have a video about this that may be useful. Look for the one called "Static Electricity and Water." Another video, "Static Electricity and Bubbles" also demonstrates the problem with humidity.

[demz56]

@JeffersonLab I get it.. Tnx for Faster Reply you helped me what I'm Doing in my Research Paper.. :)

[JeffersonLab]

@demz56 Glad to help!

[demz56]

It is Possible that the Other plastic strip are become positive and the other is negative?

[fatmayca]

thanks a llot

[mamonsin]

hahaha electroscope fight :p

[badgirl7071]

can u make an electroscope in a different way? as in building it?

[supersonicstep]

Thanks

[yomamasapeach]

sometimes plastic from juice box wrappers around the straw stick on me, and theres no glue. Do the negative and positive charge

[JeffersonLab]

If the plastic wrapper picks up a charge, it will induce a charge in you and stick to you.

[syw0429]

thanks for the vid; it is really useful :)

[JeffersonLab]

You can only tell if the charged object has the same charge or opposite charge of the electroscope. The triboelectric series tells us that dry skin tends to give up electrons to plastic, so we can assume that our electroscopes have a negative charge. At the end of the video, Joanna and Steve bring their electroscopes close to each other and they repel, so we know that they have the same charge. If you came across an electroscope 'in the wild,' you couldn't tell by looking what charge it had.

[yarah1]

How can u tell the difference between a postively charged object and a negatively charged object by using a electroscope?

[yesimstuntdude]

if you know the electroscope is negatively charged, then it's rather simple. If you put an object between the two pieces and they push farther away, the object is negatively charged. If you put the object in the middle and the pieces of plastic stick to the object, then the object is positively charged. Am I making sense?