Physics - Ch.22
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