Review Previous Day Distribution of Charges in a Neutral Conductor Homework Distribution of Charges in a Neutral Insulator Homework Charging a Conductor by Touching Inducing a Charge on a Conductor Polarization ID: 526885
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Slide1
Presentation Outline
Review Previous Day
Distribution of Charges in a Neutral Conductor (Homework)
Distribution of Charges in a Neutral Insulator (Homework)
Charging a Conductor by Touching
Inducing a Charge on a Conductor (Polarization)
Demo: Comb and paper / Rod and wood
Attraction between neutral conductor and charged object
Attraction between neutral insulator and charged object
PracticeSlide2
Exit Quiz from Yesterday
What is the difference between a conductor and an insulator?
What kind of charge is
not
able to flow freely in a conductor?
If an object acquires a positive charge, did it gain protons or lose electrons? How do you know?
Why are cars safe in a lightning storm?
What does it mean for an object to be electrically polarized
?Slide3
Let’s go back to the polarized neutral object…Slide4Slide5
If you could take a guess, would the rod and ball be attracted to or repelled by each other?
Why do you think so?Slide6
If you could take a guess, would the rod and ball be attracted to or repelled by each other?
Why do you think so?
Negative
and
Positive
are attracted!Slide7
If you could take a guess, would the rod and ball be attracted to or repelled by each other?
Why do you think so?
Negative
and
Positive
are attracted!
If we switched to a positively-charged rod, would they rod and ball attract or repel?Slide8
If you could take a guess, would the rod and ball be attracted to or repelled by each other?
Why do you think so?Slide9
If you could take a guess, would the rod and ball be attracted to or repelled by each other?
Why do you think so?
Positive
and
Negative
are attracted!
This works for any
polarized
neutral conductor.
A
charged object will always attract a neutral conductor!Slide10
So, charged objects attract conductors… What about attracting insulators?Slide11
So, charged objects attract conductors… What about attracting insulators?Slide12
So, charged objects attract conductors… What about attracting insulators?Slide13
So, charged objects attract conductors… What about attracting insulators?Slide14
So, charged objects attract conductors… What about attracting insulators?
Time for the “magic” wand!Slide15
Sticky Balloons
https://
phet.colorado.edu/en/simulation/balloonsSlide16
Charged Objects Also Attract Neutral Insulators!
When a charged object is brought near an insulator, the charges in the
insulator
can
shift
back and forth a little.
For example, a negatively charged plastic rod causes a slight shifting of charge within the molecules of the neutral wood.
The negative charges
shift so that they are
farther from the rod.The wood has an excess positive charge near the rod and so
feels an attraction.
http://regentsprep.org/Regents/physics/phys03/ainsvscon/
default.htmSlide17
Charged Objects Also Attract Neutral Insulators!
When a charged object is brought near an insulator, the charges in the
insulator
can
shift
back and forth a little.
For example, a negatively charged plastic rod causes a slight shifting of charge within the molecules of the neutral wood.
The negative charges
shift so that they are
farther from the rod.The wood has an excess positive charge near the rod and so
feels an attraction.
http://regentsprep.org/Regents/physics/phys03/ainsvscon/
default.htmSlide18
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide19
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide20
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide21
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide22
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide23
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide24
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide25
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide26
Charged Objects Also Attract Neutral Insulators!
Negatively ChargedSlide27
Charged Objects Also Attract Neutral Insulators!
Negatively Charged
Ouch!
That’s
gonna
leave a scar!Slide28
In
Conclusion… Charged Objects Attract Neutral Objects ALWAYS
Charged objects can “polarize” a neutral
conductor
—where the electrons can move freely—and become
attracted
to the neutral object.
Charged objects can “shift” the charges in a neutral
insulator—where electrons cannot move freely—and become
attracted to the neutral object.Slide29
Charged Objects ATTRACT
Neutral Objects
We have already seen how a charged object can cause electrons in a
conductor
to move around—notice that this always results in
attraction
.Slide30
Charged Objects ATTRACT
Neutral Objects
We have already seen how a charged object can cause electrons in a
conductor
to move around—notice that this always results in
attraction
.
When a charged object is brought near an insulator, the charges in the
insulator can shift
back and forth a little.For example, a negatively charged plastic rod causes a slight shifting of charge within the molecules of the neutral wood.Positive charges shift so that they are closer to the rod and so feel an
attraction.Slide31
Practice!