Sample Questions Ch. 22

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 (quarter of meter), the force on each charge will be... - 8 N - 16 N - 2 N - 1 N - 4 N

16 N

Two charged particles repel each other with a force of F. If the charge of one of the particles is doubled and the distance between them is halved, then the force will be - F/4 - F/2 - F - 2 F - 8 F

8 F

Electrostatics is a branch of electricity that focuses on... electrical force, electrical charge, or both?

Both of these when static

Two charged particles attract each other with a force of F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be - F/4 - F - 2F - F/2

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 - contact (touching) - induction (non-touching) - friction - all the above

all the above - contact (touching) - induction (non-touching) - friction

Electric potential, measured in volts, is the ratio of electric energy to the amount of electric... - current - voltage - charge - resistance

charge

If you rub and inflated balloon agains your hair and place the balloon against the wall it will stick to the wall, illustrating

charge polarization

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

A balloon will stick to a wooden wall if the balloon is charged - negatively - positively - either of these - neither of these

either of these

The force that binds atoms together to form molecule is?

electrical

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

electrical

Polin 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 - conduction - electric field - polarization

energy transfer

To become a negative ion, an atom must

gain an electron

A fundamental rule of electricity is that

like kinds of charges repel AND unlike kinds of charges attract

Conducting materials are composed of atoms with

loose outer electrons

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

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

negatively charged

Which of these does NOT have an electrical charge? neutron, proton, electron, all of them?

neutron

Which of these has the greatest mass? proton, electron, both?

proton

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

quadruples

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

repel or attract

The electrical force between electric charges depends only on their

separation distance AND magnitude

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is...? (hint think of Newton's third law) - Twice as much - Four times as much - Half as much - The same

the same

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

they are attracted by an equal number of protons

Insulating materials are composed of atoms with

tightly bound outer electrons