Where is the love?
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Electrostatics
Did you say
Adam?
“Don’t Taze Me
Bro!”
Coulomb is cool
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500
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Charge This
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Final Jeopardy

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©Norman Herr, 2003

A-100
• QUESTION: How do two electrons act when they are close to one another?
• ANSWER: They repel (like charges repel)
Answer Question

A-200
• QUESTION: Two balloons are hanging apart when you come into class, what is the charge of each balloon?
• ANSWER: They must be the same charge, either both positive or both negative
Answer Question

A-300
• QUESTION: What happens to the electrons and protons when a balloon sticks to the wall?
• ANSWER: Since the balloon is negative, all the positive protons will align closest to the balloon and all the electrons will arrange themselves furthest away
Answer Question

A-400
• QUESTION: An object that has an excess number of protons is said to have a ___________ charge.
• ANSWER: Positive
Answer Question

A-500
• QUESTION: Balloons X , Y and Z are suspended from strings as shown at the top.
Negatively charged balloon X attracts balloon Y and balloon Y attracts balloon Z.
Balloon Z is ___
• ANSWER: negative, neutral, or positive
Answer Question

B-100
• QUESTION: What three subatomic particles make up an atom?
• ANSWER: Proton, neutron, and electron
Answer Question

B-200
• QUESTION: What charge is an object with excess electrons?
• ANSWER: negative
Answer Question

B-300
• QUESTION: What is the electrical charge when there are an equal number of protons to electrons in an atom?
• ANSWER: Neutral
Answer Question

B-400
• QUESTION: What scientist discovered that electrons surround the nucleus?
• ANSWER: Bohr
Answer Question

B-500
• QUESTION: Which subatomic particle has the least mass?
• ANSWER: Electron, 9.11x10
-31
Answer Question

C-100
• QUESTION: Which particle transfers to create static electricity?
• ANSWER: Electrons
Answer Question

C-200
• QUESTION: When rubbing your rubber-soled shoes on the carpet, most of the electrons transfer from __________ to
___________.
• ANSWER: The carpet to your shoes
Answer Question

C-300
• QUESTION: How does the Van de
Graaff generator work?
• ANSWER: …
Answer Question

C-400
• QUESTION: If polyester has a higher electron affinity than wool, which one will have excess electrons when rubbed together?
• ANSWER: Polyester
Answer Question

C-500
• QUESTION: Name one example of how we use static electricity commercially:
• ANSWER: Make-up, electrostatic spray paint, dusting products, photocopiers, hair products…ect
Answer Question

D-100
• QUESTION: What unit is used to represent a charge?
• ANSWER: A Coulomb
Answer Question

D-200
• QUESTION: Two electrons are .2m away, what is the force between them?
• ANSWER: ….
Answer Question

D-300
• QUESTION: You have 5000 excess protons, what is the mass? What is the charge?
• ANSWER: ….
Answer Question

D-400
• QUESTION: Two ping pong balls have been painted with metallic paint and charged by contact with an Van de Graaff generator. The charge on the balls are -
3.1x10
-7 C and -3.7x10
-7 C. Determine the force of electrical repulsion when held a distance of 42 cm apart.
• ANSWER: 5.8x10
-3 N
Answer Question

D-500
• QUESTION: What happens to the size of the force between 2 charges when 1 of the charges doubles? Hint: use Coulomb’s Law
• ANSWER: Force also doubles. They are directly related.
Answer Question

E-100
• QUESTION: What charging process happens when two objects are rubbed together?
• ANSWER: Charging by Friction!!
Answer Question

E-200
• QUESTION: When a negative object touches a neutral object, the neutral object becomes _____ because it _____ electrons
• ANSWER: negative, gains
Answer Question

E-300
• QUESTION: When a negative object is grounded it now has a ________ charge.
If you use your finger to ground the object, where do all the electrons go?
• ANSWER: Neutral charge, the excess electrons transfer through your body to the ground
Answer Question

E-400
• QUESTION: How can you make a neutral object positive?
• ANSWER: Charging by conduction with a positive object
Answer Question

E-500
• QUESTION: Explain how to charge a neutral object by induction
• ANSWER: 1. Hover a charged object over the neutral object 2. Ground the object 3. Take away the charged object and voila!
Answer Question

FINAL JEOPARDY
You must answer both questions correctly to win!
• Question 1: Why does a rubber strip become negatively charged when rubbed with fur?
Answer Question