What are the three ways to make an object electrically charged?
What is conduction, induction, and charging by friction
100
What is an insulator? What is a conductor?
An insulator is a substance in which the electrons are so tightly bound to the atoms making up the material that they are not free to move to a neighbouring atom. A conductor allows electrons to flow freely form one atom to another.
100
What is an electric force?
It is the force that exists between static charges. It can either pull static charges together (force of attraction) or push the static charges apart (force of repulsion).
100
Lighting is a form of?
What is static electricity (harmful)
200
Who demonstrated that lightning is a form of electricity
Who is Benjamin Franklin
200
What is charging by friction and please give one example.
When two objects are rubbed against each other, the friction causes electric charges to be transferred to another. Examples may vary
200
We use a metal-leaf electroscope to determine the presence of _______.
Electric charges
200
What is the SI unit for size of the electric charge?
coulomb (C)
200
What's the temperature a single lighting flash can produce?
What is 3000 degree Celsius
300
What Is the law of electric charges
What is unlike charges attract and like charges repel
300
What is charging by conduction and please give one example
When
300
Give 5 examples of good conductors.
Answers may vary. EX: Silver, copper, gold, aluminum, tungsten, nickel, tap water.
300
What is a Van de Graaff generator and what are it's purposes?
It is a device that separates large quantities of electric charge. It is used to research static electricity to make static charges available for experimentation. It is also used for educational and entertainment purposes.
300
How wide is the pathway connecting cloud to the Earth's surface?
What is 5cm wide
400
How many times larger is a proton than an electron?
What is 1800 times larger.
400
What is charging by induction and give one example
When objects are charged without direct contact, examples may vary
400
Why don't cellphones and radios work in elevators and buildings made of metal?
Because the building acts as a Faraday cage.
400
What is Coulomb's Law?
"The strength of the electric force increases with increasing electric charges and decreases with increasing distance."
400
What does burning coal produce? What do ash particles contribute to?
Pollutants. Global warming, acid rain, and pollution.
500
What is an induced charge separation?
When a neutral object is brought near a charged object the electrons in the neutral object has shifted, but the object hasn't lost any electrons as a result the object remains neutral.
500
Briefly explain what happens when a positively charged strip is brought near a metal-leaf electroscope.
The ball on the top of the electroscope becomes negatively charged and the two leaves become positively charged. Since the two leaves have the same charge, they repel each other and spread out. When the strip is taken away, there is no longer an induced separation of charge and the leaves turn back to its original position.
500
Explain how the Van de Graaff generator works. (Mention the parts of the generator)
An electric motor turns a rubber belt on a roller past a negatively charged comb. As the belt goes past the charged comb, it picks up negative charges and carries them up to the collecting comb. The negative charges leave the belt at the collecting comb. They are conducted to the large hollow metal sphere where they spread across the outside surface of the sphere.
500
What reduces friction between clothes?
Fabrics contain a chemical that is slightly oily and coats the surface clothes leaving them soft. It neutralizes the fabric sheet.