physics chapter 22
Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled to 3-m separation distance, the force on each charge will be...
0.11 N.
Assume that 10 J of work is needed to push a charge, at rest, into an electric field. After the charge is released there, it flies back to its starting position and its kinetic energy there will be...
10 J.
The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located?
30 N/C
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
F.
When a single charge q is placed at one corner of a square, the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square, the electric field at the center of the square due to these three equal charges is
F/q.
An electron volt, eV, is a unit of energy. Which is larger, a GeV or a MeV?
GeV
Coulomb's law is most similar to which of these laws?
Newton's law of gravity
The net charge on a charged capacitor depends on... the distance between the capacitor plates. the area of the capacitor plates. the medium between the capacitor plates. All of the above choices are correct.
None of the above choices are correct - the net charge is zero.
A highly charged child's balloon is not dangerous because... its outside surface is positively charged. the potential difference between the balloon and the child's hand is very small. rubber is not a good conductor of electricity.
None of the above choices are correct.
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... half as much. twice as much. the same. four times as much.
None of the above choices are correct.
The electric field inside the dome of a Van de Graaff generator... depends on the volume of the dome depends on the amount of charge the outside of dome. Choices A and B are both correct.
None of the above choices are correct.
The unit of electric charge, the coulomb, is the charge on
a specific large number of electrons.
An electric field is basically _______.
a vector quantity
Superconductors are noted for their
absence of electric resistance.
An electron and a proton
attract each other.
Electric charge can be transferred from one conducting body to another _______.
by both contact and closeness
To say that electric charge is conserved is to say that electric charge
can be neither created nor destroyed.
A highly-charged party balloon is not dangerous when it _______.
contains little overall energy
Two charged particles held close to each other are released. As the particles move, the velocity of each increases. Therefore, their charges have
either the same or opposite signs.
Every proton in the universe is surrounded by its own
electric field and gravitational field.
Which force binds atoms together to form molecules?
electrical
A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?
electron
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus.
You can touch a 100,000-volt Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of
energy.
To say that electric charge is quantized is to say that the charge on an object
is a whole-number multiple of the charge of one electron.
To say that an object is electrically polarized is to say
its charges have been rearranged.
Charge carriers in a metal are electrons rather than protons because electrons are
loosely bound.
The electrical force between charges depends only on the charges'
magnitude and separation distance.
If you comb your hair and the comb becomes positively charged, then your hair becomes
negatively charged.
Rub electrons from your hair with a comb and the comb becomes
negatively charged.
Strip electrons from an atom and the atom becomes a
positive ion.
When the distance between two charges is halved, the electrical force between the charges
quadruples.
A main difference between gravitational and electric forces is that electrical forces
repel or attract.
A difference between electric forces and gravitational forces is that gravitational forces are not affected by
repulsive interaction
A transistor is an example of a
semiconductor.
When we say charge is conserved, we mainly mean that charge can be _______.
transferred without loss, like money in a bank
Electric potential, unlike electric potential energy, is measured in units of _______.
volts
Most atoms normally have a net charge that is _______.
zero
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
The electric field inside the dome of a highly charged Van de Graaff generator is _______.
zero
The net charge on a polarized molecule is normally _______.
zero
The net charge on an energized capacitor is normally _______.
zero
When a car is struck by lightning, the resulting electric field inside the car is
zero.