Ch 22

An electron and a proton

attract each other.

A fundamental rule of electricity is that

both of these

The pair of protons in the nucleus of a helium atom

attract a pair of orbiting electrons.

To become a positive ion, an atom must

lose an electron

It is said that electric charge is quantized, which means that the charge on an object

is a whole-number multiple of the charge of one electron

The electrical force between charges is strongest when the charges are

close together

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 charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will be

16 N

Superconductors most often require

low operating temperatures.

Superconductors are noted for their

absence of electric resistance.

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

either of these

Rub electrons from your hair with a comb and the comb becomes

negatively charged.

To say that an object becomes electrically polarized means that

its charges have been rearranged.

An uncharged pith ball is suspended by a nylon fiber. When a positively-charged rubber rod is brought nearby, the pith ball

moves toward the rod.

The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is

30 N/C.

A reason for electric shielding inside a conductor is that any free electrons inside would

be set in motion until equilibrium is established, on the outside.

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

zero

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

none of the above

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

none of the above

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

both of these

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

they are attracted by an equal number of protons.

Just as "gravity" is the study of a wide range of gravitational interactions, "electricity" is the study of a wide range of

electrical interactions

A positive ion has more

protons than electrons

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

net charge has been created or destroyed

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

electrical

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

repel or attract

Two charges that are 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

Insulating materials are composed of atoms with

tightly bound outer electrons.

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

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

either of these

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.

Every isolated proton in the universe is surrounded by its own

both of these

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.

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

electron

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

The fundamental force underlying all chemical reactions is

electrical

Which of these has the greatest mass?

proton

If electrons are stripped from an atom it becomes a

positive ion

To become a negative ion, an atom must

gain an electron

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

F/2

The electrical force between electric charges depends only on their

both of these

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

0.11 N

A semiconductor can be

…

A conductor differs from an insulator in that a conductor has more

None of these

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

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

all of the above

Electric charge distributes itself on conducting surfaces

both of the above

The electric field between oppositely-charged parallel plates is

uniform

The force that binds atoms together to form molecules is

electrical

In an electrically neutral atom the number of protons in the nucleus is equal to the number of

electrons that surround the nucleus

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

specific large number of electrons.

The primary purpose of a lightning rod is to

discharge the structure to which it is attached.

Before a thunder storm, clouds in the sky likely become

polarized

Much of the charge on a conducting cube is

mutually repelled toward its corners.

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

wood

If 10 J of work is used in pushing 1 C of charge into an electric field, its electric potential relative to its starting position is

10 V

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

None of these