# Shared Flashcard Set

## Details

Chapter 32: Electrostatics Questions
Chapter 32: Electrostatics Questions
42
Physics
01/09/2012

Term
 Electricity at rest is called ___________.
Definition
 electrostatics
Term
 From where do electrical forces arise?
Definition
 Particles in atoms electrons (-), protons (+) and neutrons (0)
Term
 State the concept of conservation of charge.
Definition
 Net electric charge is neither created nor destroyed, but is transferred from one material into another
Term
 The unit of charge is the _____________.
Definition
 coulomb
Term
 Write Coulomb's law and tell me what the symbols stand for.
Definition
 F = K q1q2/d2 k – proportionality constant q1 – charge of particle one q2 – charge of particle two d – distance between the particles
Term
 What makes a good insulator?
Definition
 The electrons are tightly bound and remain with an atom.
Term
 Materials that can be made to behave sometimes as insulators and sometimes as conductors are called ________________.
Definition
 semiconductors
Term
 Metals that have infinite conductivity (zero resistance to the flow of charge) are called what?
Definition
 superconductors
Term
 Name the term applied to electric charge that has been redistributed on an object because of the presence of a charged object nearby.
Definition
 induce
Term
 The charging of an object without direct contact is ___________________.
Definition
 induction
Term
 What is the term applied to an atom or molecule in which the charges are aligned so that one side is slightly more positive or negative that the opposite side?
Definition
 Electrically polarized
Term
 All electrons have the same amount of ____________________ charge
Definition
 negative
Term
 A proton has a ___________ charge that is equal in magnitude to the negative charge of the ______________.
Definition
 positive electron
Term
 Do like charges repel or attract?
Definition
 repel
Term
 Do unlike charges repel or attract?
Definition
 attract
Term
 _______________ move easily in good conductors
Definition
 Electrons
Term
 T/F Electrons do move easily in good insulators.
Definition
 False
Term
 How do objects become charged?
Definition
 When electrons move onto them or off of them
Term
 Charging by friction occurs when electrons are transferred by ___________.
Definition
 rubbing
Term
 Charging by contact occurs when electrons are transferred by ____________ _____________.
Definition
 direct contact
Term
 Charging by induction occurs in the presence of a charge ________ ________________contact.
Definition
 without physical
Term
 Charge polarization occurs in insulators that are in the presence of a ___________________ ___________.
Definition
 charged object
Term
 What is the fundamental rule of electricity?
Definition
 Like charges repel, opposite charges attract
Term
 You have a neutrally charged atom with 6 electrons. How many protons does it have?
Definition
 6
Term
 If you have an atom that has 6 electrons and 7 protons, what is the charge?
Definition
 positive
Term
 A charged atom is called an __________________.
Definition
 ion
Term
 A positive ion has lost an __________________.
Definition
 electron
Term
 A negative ion has gained or lost one or more electrons?
Definition
 gained
Term
 If an object has an abundance of protons or electrons it is ____________ ________________.
Definition
 electrically charged
Term
 Can an atom lose protons?
Definition
 No
Term
 Which holds electrons tighter, fur or rubber?
Definition
 rubber
Term
 When you rub fur on rubber what happens to the fur?
Definition
 The fur does not hold tightly to electrons so it lets go of electrons
Term
 When you rub fur on rubber what happens to the rubber?
Definition
 The rubber accepts the electrons from the fur, making it electrically charged.
Term
 When the rubber accepts electrons from the fur, what is the charge of the rubber?
Definition
 negative
Term
 When the rubber accepts electrons from the fur, what is the charge of the fur?
Definition
 positive
Term
 Why does closeness win when an object is electrically polarized?
Definition
 Coulomb's law
Term
 What kind of law is Coulomb's law?
Definition
 Inverse square
Term
 Besides Coulomb's law, name another inverse square law.
Definition
 Newton's law of gravitation
Term
 Name two differences between Newton's law of Gravitation and Coulomb's law.
Definition
 Newton : g – small, attract. Coulomb: k – large, repel and attract.
Term
 Friction is/is not a necessary factor in charging an object.
Definition
 is not. Electrons can be transferred from one material to another simply by touching.
Term
 The continual leaking of charge of the bottom of clouds (-), and the ground (+) is helped by what?
Definition
 Lightning rods
Term
 What happens if a lightning rod does strike a building with a lightning rod attached to it?
Definition
 The lightning rod short-circuits the lightning back into the ground.
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