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Presentation on theme: "Charging by Induction"— Presentation transcript:
Slide1
Charging by Induction
Slide2
Charging by Induction: Temporarily
induced charge separationcharging by induction
When a charged object is brought close to, but not touching, a neutral object, the electrons in the neutral object move either away from or toward the charged object.
When electrons move within an object because of a nearby charged object, it is called
induced charge separation
.
Slide3
Charging by Induction: Temporarily
Slide4
Once the charged object is moved away, the electrons in the neutral object return to their original positions.
Charging by Induction: Temporarily
Slide5
Animation of Temporary Induction
Charging by Induction: Temporarily
Slide6
You can permanently charge an object using induction. To do this, you need to ground the neutral object.
Charging by Induction: Permanently
Slide7
Charging by Induction: Permanently
A negatively charged object is placed near a neutral object, causing the electrons to move.
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Slide8
Charging by Induction: Permanently
The neutral object is grounded, allowing the repelled electrons in the neutral object to escape to the ground. The neutral object loses electrons.
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Slide9
Charging by Induction: Permanently
The ground is removed, leaving the ball with a positive charge.
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Slide10
If electrons move from the neutral object through the wire to the ground (object loses electrons), the object becomes positively charged.If electrons move from the ground through the wire toward the object (object gains electrons), the object becomes negatively charged.
Charging by Induction: Permanently
Slide11
Animation of Permanent Induction
Charging by Induction: Permanently
Slide12
Applications of Static Electricity
Application
Science principles involved
How the application works
Electrostatic speakers
charging by induction, law of electric charges
In an electrostatic speaker, an audio transformer induces opposite electrical charges on two outer plates (stators) and then (b) reverses them.
Slide13
Note: Charging by Induction
This method of charging objects involves
no contact between a charged object and a neutral object
, and
grounding
is used.
Slide14
Note: Charging by Induction
1.
Negative
Neutral
Slide15
Note:
Charging by Induction
1.
Negative
Neutral
e
-
Slide16
Note: Charging by Induction
1.A negatively charged rod is placed near a neutral object. The excess electrons in the rod repel the _____________ in the object making them move as far away from the rod as possible. This shifting of electrons makes one side of the object __________________ and the other side _________________ (however, the object is still neutral). This is called _____________________________.
electrons
positive
negative
induced charge separation
Slide17
Note:
Charging by Induction
2.
Negative
Ground
e
-
Slide18
Note: Charging by Induction
2. If the neutral object is grounded, the repelled electrons move from the ____________ to the ___________ (the object _________ electrons).
object
ground
loses
Slide19
Note:
Charging by Induction
3.
Negative
Positive
Slide20
Note: Charging by Induction
3. When the ground is removed, the object is left with a _____________ charge (because it _________ electrons to the ground).
positive
lost
Slide21
*** When objects are permanently charged by induction, the induced charge is always ______________ that of the charged object.
Note: Charging by Induction
opposite
Slide22
Charging by Induction Questions1. Temporary Induction
A. A neutral metal-leaf electroscope.B. A negatively charged object is placed near (not touching) the metal ball of a neutral metal-leaf electroscope.C. The charged object has been removed.
Slide23
Charging by Induction Questions1. Temporary Induction
A. A neutral metal-leaf electroscope.B. A negatively charged object is placed near (not touching) the metal ball of a neutral metal-leaf electroscope.C. The charged object has been removed.
e
-
Slide24
Charging by Induction Questions1. Temporary Induction
A. A neutral metal-leaf electroscope.B. A negatively charged object is placed near (not touching) the metal ball of a neutral metal-leaf electroscope.C. The charged object has been removed.
e
-
Slide25
Charging by Induction Questions1. Temporary Induction
A. A neutral metal-leaf electroscope.B. A negatively charged object is placed near (not touching) the metal ball of a neutral metal-leaf electroscope.C. The charged object has been removed.
e
-
Slide26
Charging by Induction Questions2. Permanent Induction
A. A positively charged object is placed near (not touching) a neutral
electroscope
.B. The electroscope is then grounded. C. The ground is removed. Then the charged object is removed.
Slide27
Charging by Induction Questions2. Permanent Induction
A. A positively charged object is placed near (not touching) a neutral
electroscope
.B. The electroscope is then grounded. C. The ground is removed. Then the charged object is removed.
