Negative Induction
Charging without contact using a negatively charged object
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Induction
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The Physics
INduction - Charging w/o contact
Conduction and Induction
No charge is transferred Electrons redistributed
Conduction - Case II - Induction w/ Negative Rod
Frame 1 - Neutral Electroscope
#p = #e-
Frame 2 - Rod comes near
Compare #p with #e- #p = #e-
Electroscope is neutral
Knob (top) Positive Leaves - negative
Frame 3
Electroscope is neutral
Which diagram best represents the charge distribution on three neutral spheres when a positively charged rod is brought near sphere x, but does not touch it?
Jan. 2003 Regents
Choice 4 Electrons are attracted to rod
Why does a charged balloon stick to a wall?
Pith ball and negative rod
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Physics
School blocks YouTube? Pith Ball And A Charged Rod.mp4
What charge(s)
Negative or Neutral
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is charging by induction?
2. A negative rod is brought near (not touching) the knob of a neutral electroscope. What happens?
3. While the negative rod is held near (not touching), what is the electroscope's overall charge?
4. A positive rod is brought near one end of a neutral metal sphere. How do the electrons move?
5. Why does a negatively charged balloon stick to a neutral wall?