physics chapter 22

The electrical force between charges is strongest when the charges are

close together

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

closer together

Two charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have

the same sign

The vast numbers of electrons in a coin don't fly off the surface because

they are attracted by an equal number of protons

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 pushes a charge initially at rest into an electric field. If the charge is then released, it flies back to its starting position with a kinetic energy of

10 J

Two charges that are separated by one meter exert 2-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will be

32 N

Two charged particles repel each other with a force F. If the charge of both particles is tripled and the distance between them is also tripled, then the force will be

F

A common naturally-polarized bit of matter is

a water molecule

Electrons can be transferred from one place to another by the process of

all of the above

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

becomes polarized

Electric charge distributes itself on conducting surfaces

both of the above

Electrostatics is a branch of electricity that focuses on

both of the above when static ( electrical force and electrical charge)

Two charged particles held close to each other are released. As they move, their speeds increase. Therefore, their charges have

either of the above ( the same or opposite sign)

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

either of the above (positively or negatively)

Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is

electrical

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

electron

Lillian safely touches a 100,000-volt Van de Graaff generator. Although the voltage is high, the relatively small amount of charge means a relatively small amount of

energy transfer

A positive charge and a negative charge held a certain distance apart are released. As they move, the force on each particle

increases

Conducting materials are composed of atoms with

loose outer electrons

To become a positive ion, an atom must

lose an electron

Much of the charge on a conducting cube is

mutually repelled toward its corners

Which of these does NOT have an electrical charge?

neutron

The electric field inside the dome of a Van de Graaff generator depends on the

none of the above

Two charged particles held a certain distance apart are released. As they move, the force on each particle increases. Therefore, their charges have

opposite signs

If electrons are stripped from an atom, it becomes a

positive ion

A positive ion has more

protons than electrons

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

repel or attract

The electric field between oppositely-charged parallel plates is

uniform

During a lightning strike, you don't want to be inside a building framed with

wood