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