Electrostatics

If on a chemical reaction a neutrak atom gains one electron, what is the net charge of this atom

-1.6 x 10^-19C

direction of a force

-opposite charges attract -like charges repel -have to look at the force on each object individually

The electrostatic force between two charges located 8 meters apart is 0.10 N. What will the force be between these charges when they are located 2 meters apart

1.6 N

Two point charges initially 4 cm apart are moved to a distance of 12 cm apart. By what factor does the resulting electric force between them charge

1/9

How is the electric force between two charges affected when the distance between the charges is halved

4 times as much

Assume a rubber rod is rubbed against a rabbit fur and gains 5 electrons. How many electrons did the fur lose

5 electrons

Two charges separated by a distance of 1 meter exert a 2-N force on each other. If the magnitude of each charge is doubled, the force on each charge is

8 N

An object with a negative charge would ___________ an object with a neutral charge

Attract

opposite charges

Attract

Electric field lines are directed _______ positive charges a _______ towards negative charges

Away from, toward

What do electrice forces do

Causes objects to repel or attract each other

charging by induction

Charging an object without direct contact between the object and a charge (requires polarization and grounding)

Charging an object with direct contact is called

Conduction

What materials charge most easily

Conductors

Which is not a good insulator

Copper

What is the unit of electric charge

Coulomb

An electric field has both what

Direction and magnitude

When a balloon is charged negatively by rubbing it on your head, what happens

Electrons are added to the balloon

The distance between two charges qa and qb is r, and the force between them is F. What is the force between them if the distance between them is doubled

F/4

How is the electric force between two charged affected when both of the charges are doubled

Four times as much

When a balloon is rubbed on clothes it acquires a charge by

Friction

What is not a good conductor of electricity

Glass

What do u call the process of charging a conductor by bringing it near anotner charged object

Induction

What is the process of charging a conductor by bringing it near another charged object and grounding it

Induction

A student touches a negatively charged rod to a neutral electroscope. What happens to the electriscope

It becomes negative

What unit is used to measure electric potential energy

Joule

An atom gains an electron. What type of charge does it have now

Negative

What is the overall charge of an object that has been charged by polarization

Neutral

Are charged objects attracted to neutral objects

No

an electroscope is given a negative charge by conduction. The electroscope is then "grounded" by touching with a finger. This means that the electroscope now has

No net charge

How is the electric force between two charges affected when the distance between the charges is doubled

One-quarter as much

Electric forces can be either attractive or repulsive. In contrast, gravitational force is

Only attractive

Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles have

Opposite signs

A student brings a negatively charged rod close to a neutral electroscope but does not touch it. The students lab partner touches the electroscope with his finger. After removing the finger touching the electroscope and the charged rod, what charge is now on the electroscope

Positive

After you rub a balloon on your hair, the balloon has a negative charge. What charge does you hair have

Positive

An atom loses an electron. What type of charged ones it have now

Positive

An atom that has more protons than electrons would have what charge

Positive

When a glass rod is rubbed with silk and the glass rod becomes positively charged, what happens to the electrons

They are removed from the rod

What happens to two like charges

They repel

What unit is used to measure electric potential

Volt

When a electron is brought near a negatively charged sphere, its potential energy increases. The reason this happens is that

Work has been done to bring the charges together

conductors

allow charge to flow freely

charging by conduction (contact)

contact of a charged object onto a neutral object

vector quantity

direction matters

The direction the electric field lines shows the

direction of the force on a test positive charge

insulator

does not allow charge to flow freely

The law of conservation of charge states that

electric charge is not created or destroyed

A positive charge and a negative charge held near each other are released. As they move, the force on each particle

increases

good conductors

metal, gold, water, copper, silver

Charge of an electron

negative

Two charges are separated by a certain distance. If the magnitude of each charge is doubled, the force on each charge is

quadrupled

When the distance between two charges is halved, the electrical force between the charges

quadruples

grounding

removal of excess charge on an object by transferring electrons to another object of greater size

Like charges

repel

polarization

separation of opposite charges within an object (not charging)

charging by friction

two objects rub together and one becomes positively charged and the other becomes negatively charged