Electrostatics (chapt 22)

An electron is pushed into an electric field where it acquires a 1-V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two electrons is

1 V

Assume that 10 J of work is need to pusha charge, at rest, into an electric field. After the charge is released there, it flies back to its starting position and its kinetic energy there will be

10 J

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

4 N

If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is

10 V

Two charges separated by one meter extert 1-N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be

16 N

Superconductors are noted for their

absence of electric resistance.

An electron and a proton

attract each other

The direction of an electric field is the direction of the force that the field would exert on

a proton

The unit of electric charge, the coulomb, is the charge on

a specific large number of electrons

An uncharged pith ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pith ball

becomes polarized

Electric potential, measured in volts, is the ration of electrical energy to amount of electric

charge

Normally a small party balloon charged to several thousand volts will have a relatively small amount of

charge and energy

The electrical force between charges is strongest when the charges are

close together

The primary purpose of a lightning rod is to

discharge the structure to which it is attached

A balloon will stick to a wooden wall if the balloon is charged

either positively or negatively

The electric field inside the dome of a Van de Graaff generator (OPTIONS: (a) depends on the amount of charge outside of dome (b) depends on the volume of the dome (c) both a and b are correct (d) none of the above

none of the above choices are correct

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

increases

Charge carrieres in a metal are electrons rather than protons because electrons are

loosely bound

The electricla force between charges depends only on the charges'

magnitude and separation distance

If you comb your hair and the comb becomes positively charged, then your hair becomes

negatively charged

To say that electric charge is conserved means that no case has ever been found where the

net charge has been created or destroyed

A difference between electric forces and gravitational forces are nto affected by

repulsive interaction

Two protons attract each other gravitationally and repel each other electrically. By far the greater force is

the electrical repulsion

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is

the same

Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles have

the same sign

Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled to 3-m separation distance, the force on each charge will be

0.11 N

The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located?

30 N/C

When a single charge q is placed on one corner of a square, the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square, the electric field at the center of the square due to these three equal charges is

F/q

Every proton in the universe is surrounded by its own

electric field and gravitational field

The fundamental force underlying all chemical reactions is

electrical

Which force binds atoms together to form molecules?

electrical

A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?

electron

You can touch a 100,000-volt Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of

energy

An electroscope is charged positively as shown by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves

fall closer together

When a single charge q is placed on one corner of a square, the electric field at the center of the square is F/q. If three other equal charges are placed on the other corners, the electric field at the center of the square due to these four equal charges is

none of the above choices are correct

A conductor differs from an insulator in that a conductor

none of these

Strip electrons from an atom and the atom becomes a

positive ion

A negatively charged rod is held near a metal can that rests on a dry wood table. If you touch the opposite side of the can momentarily with your finger, the can is then

positively charged

After a capacitor is fully charged, the total number of electrons it contains

remains unchanged

A main difference between gravitational and electric forces is that electrical forces

repel or attract

In the unlikely case of a lightning strike, it is worse to be inside a builiding framed with

wood

The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then

zero

When a car is struck by lightning, the resulting electric field inside the car is

zero