Physics - Ch.22

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Electrons can be transferred from one place to another by the process of... a.friction. b.none of the above c.all of the above d.induction, which means non-touching. e.contact, which means touching.

c. all of the above

The electrical force between electric charges depends only on their... a.neither of these b.separation distance. c.both of these d.magnitude.

c. both of these

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

loosely bound

To become a positive ion, an atom must

lose an electron

Superconductors most often require

low operating temperatures

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

negatively charged

A positively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes

negatively charged.

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

net charge has been created or destroyed.

Before a thunder storm, clouds in the sky likely become

polarized

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

positively charged

Which of these has the greatest mass?

proton

A positive ion has more

protons than electrons.

A transistor is an example of a

semiconductor

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

specific large number of 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

Insulating materials are composed of atoms with

tightly bound outer electrons

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.

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

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

4N

Conducting materials are composed of atoms with

loose outer electrons

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

Zero

A common naturally-polarized bit of matter is

a water molecule

Normally a small party balloon charged to several thousand volts will have a relatively small amount of... a.both of these b.energy. c.neither of these d.charge.

a. both of these

Electrostatics is a branch of electricity that focuses on... a.both of these when static. b.electrical force. c.electrical charge. d.none of the above

a. both of these when static

A balloon will stick to a wooden wall if the balloon is charged... a.either of these b.neither of these c.negatively. d.positively

a. either of these

Superconductors are noted for their

absence of electric resistance.

Electric shielding within a conductor is a consequence of

all of the above

An electron and a proton

attract each other

Between a pair of equal and opposite charges, field lines are... a.more concentrated closer to the charges. b.all of the above c.none of the above d.directed from positive to negative. e.vectors, with patterns that stem from the inverse-square law.

b. all of the above

Electric shielding within a conductor is a consequence of... a.none of the above b.all of the above c.cancellation of electric field lines. d.both the attraction and repelling nature of electricity. e.the balancing of opposing forces.

b. all of the above

A fundamental rule of electricity is that... a.like kinds of charges repel. b.both of these c.neither of these d.unlike kinds of charges attract.

b. both of these

A semiconductor can be... a.an insulator. b.both of these c.neither of these d.a conductor.

b. both of these

Two charged particles held close to each other are released. As they move, their speeds increase. Therefore, their charges have... a.need more information b.either of these c.the same sign. d.opposite signs.

b. either of these

A conductor differs from an insulator in that a conductor has more... a.protons than electrons. b.none of the above c.faster moving molecules. d.electrons than protons. e.energy than an insulator.

b. none of the above

The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is... a.the same. b.none of the above c.four times as much. d.twice as much. e.half as much.

b. none of the above

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

It is said that electric charge is conserved, which means that electric charge

can be neither created nor destroyed

A conductor differs from an insulator in that a conductor has more... a.4F/q. b.F/(2q). c.F/(4q). d.F/q. e.none of the above

e. none of the above

The force that binds atoms together to form molecules is

electrical

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

electrical

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

electrical interactions

To become a negative ion, an atom must

gain an electron

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

increases

An electrically charged atom is an

ion


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