Is the mass of an amber rod after it is charged with fur greater than, less than, or the same as its mass before the charging?
(amber: ---, fur: ++++++)
greater than
its charge will be less negative, it will have gained e- and, therefore, mass.
An electron and a proton separated by distance d are released from rest simultaneously. The two particles are free to move. When they collide, are they at the midpoint of their initial separation, closer to the initial position of the proton, or closer to
since the e- moves much faster than the proton, the final position of collision is much closer to the proton.
F=ma -> a=F/m
m(e-) = -e
m(p) = +e
Which of the following statements are true?
a) A neutral object contains no charge.
b) Two negative charges repel each other.
c) Electric charge is quantized.
d) Electric charge is conserved.
e) Two positive charges attract each other.
f) A positive charg
B, C, D, F
Two charged objects are separated by some distance. The charge on the first object is greater than the charge on the second object. How does the force between the two objects compare?
a) The charged objects exert electrostatic forces on each other that ar
c) The charged objects exert electrostatic forces on each other that are equal in magnitude and opposite in direction.
Two charged objects separated by some distance attract each other. If the charges on both objects are doubled with no change in distance between them, what happens to the magnitude of the force between the objects?
a)The force between them quadruples.
b)
a)The force between them quadruples.
Fe = k |q1| |q2|/ r^2
A plastic rod is rubbed with a fur. During the rubbing process, the rod acquires a negative charge. What type of charge does the fur acquire?
a) The fur acquires either a negative or positive charge, depending on how hard the rod was rubbed.
b) The fur re
d) The fur acquires a positive charge.
A positively charged rod is brought close to one end of an uncharged metal rod but does not actually touch it. What type of charge does the end of the metal rod closest to the positively charged rod acquire?
a) The end of the metal rod closest to the posi
d) The end of the metal rod closest to the positively charged rod acquires a negative charge
A monatomic ideal gas expands at constant pressure. Is heat added to the system or taken from the system during this process?
a) heat is added to the system
b) heat is taken from the system
a) heat is added to the system
Which of the following statements are true?
a) Heat is converted completely into work during isothermal expansion.
b) Isothermal expansion is reversible under ideal conditions.
c) During the process of isothermal expansion, the gas does more work than dur
A and B
An ideal gas expands through an adiabatic process. Which of the following statements is/are true?
a) The work done by the gas is negative, and heat must be added to the system.
b) The work done by the gas is positive, and no heat exchange occurs.
c) The i
B, D
After the adiabatic expansion described in the previous part, the system undergoes a compression that brings it back to its original state. Which of the following statements is/are true?
a) The total change in internal energy of the system after the entir
A, D
Which of the following statements are true for electric field lines?
a) Electric field lines are continuous; they do not have a beginning or an ending.
b) Electric field lines can never intersect.
c) Electric field lines are close together in regions of s
B, D, E
A disk with a radius of R is oriented with its normal unit vector at an angle ? with respect to a uniform electric field. Which of the following would result in an increase in the electric flux through the disk?
a) increasing the given orientation angle o
C,D,E
Which of the following statements are true?
a) The electric force acting on a point charge is proportional to the magnitude of the point charge.
b) Electric field lines near negative point charges circle clockwise.
c) The electric field created by a point
A,D,E
Gaussian surfaces A and B enclose the same positive point charge. The area of surface A is two times larger than that of surface B. How does the total electric flux through the two surfaces compare?
a) The total electric flux through the two surfaces is e
A - the total electric flux is equal
Remember that surface area cancels out in Gaussian surfaces
A solid conducting sphere is placed in an external uniform electric field. With regard to the electric field on the sphere's interior, which statement is correct?
a) The interior field points in a direction opposite to the exterior field.
b) The interior
c) There is no electric field on the interior of the conducting sphere.
The induced charges produce a field withing the conductor that exactly cancels the external field. E = 0 inside the conductor.
A net charge is placed on a hollow conducting sphere. How does the net charge distribute itself?
a) The net charge uniformly distributes itself on the sphere's outer surface.
b) The net charge clumps together at some location within the sphere.
c) The net
a) The net charge uniformly distributes itself on the sphere's outer surface.
Is it possible for the electric field between two positive charges to equal zero along the line joining the two charges?
a) This cannot be determined without knowing the separation between the two charges.
b) Yes, regardless of the magnitude of the two ch
b) Yes, regardless of the magnitude of the two charges.
A positive charge moves in the direction of an electric field. Which of the following statements are true?
a) The electric field does negative work on the charge.
b) The potential energy associated with the charge decreases.
c) The electric field does not
B, E
Which of the following statements are true?
a) An equipotential surface is a three-dimensional surface on which the electric potential is the same at every point.
b) When all charges are at rest, the surface of a conductor is always an equipotential surfa
...
A negative charge moves in the direction of an electric field. Which of the following statements are true?
a) The electric field does negative work on the charge.
b) The electric field does not do any work on the charge.
c) The sign of the work done on th
A, F
Which of the following statements are true?
Check all that apply.
a) The insertion of a dielectric material between the two conductors in a capacitor allows a higher voltage to be applied to the capacitor.
b) Dielectrics allow electric charge to flow as e
A, C
A parallel-plate capacitor is connected to a battery. After it becomes charged, the capacitor is disconnected from the battery and the plate separation is increased. What happens to the potential difference between the plates?
a) More information is neede
D
When the capacitor is disconnected from the battery, the charge on the plates cannot change (Q = C?V). Increasing the distance between the plates decreases the capacitance (C =?0A/d). Therefore, the potential difference must increase.
Which of the following statements are true?
Check all that apply.
a) The electric field between the plates of a parallel-plate capacitor is uniform.
b) A capacitor consists of a single sheet of a conducting material placed in contact with an insulating ma
A,C, D
A parallel-plate capacitor connected to a battery becomes fully charged. After the capacitor from the battery is disconnected, the separation between the plates of the capacitor is doubled in such a way that no charge leaks off. How is the energy stored i
C
V = E*d
A dielectric material, such as Teflon�, is placed between the plates of a parallel-plate capacitor without altering the structure of the capacitor. The charge on the capacitor is held fixed. How is the electric field between the plates of the capacitor af
B
Which of the following will increase the capacitance of a parallel-plate capacitor?
Check all that apply.
a) Decreasing the separation between the plates will increase the capacitance of a parallel-plate capacitor.
b) Increasing the separation between the
A, C
A negative charge moves in a direction opposite to that of an electric field. What happens to the energy associated with the charge?
a) The electric potential energy of the charge decreases, and the kinetic energy increases.
b) Both the electric potential
...
Which of the following statements are true?
Check all that apply.
a) In a circuit, current is delivered by the positive terminal of a battery, and it is used up by the time it returns to the negative terminal of the battery.
b) Current is the total amount
B, E
Which of the following statements are true?
Check all that apply.
a) The potential difference between the terminals of a battery, when no current flows to an external circuit, is referred to as the terminal voltage.
b) A battery is a device that produces
B, C
Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare?
Check all that apply.
a) Wire A has twice the resistance of wire B.
b) Wire A and wire B ha
...
A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance? R=?(L/A).
a) It decreases by a factor of 4.
b) It decreases by a factor of 2.
c) It stays the same.
d) It in
e) It increases by a factor of 4
R=?(L/A).
2L and 1/2 A --> 4R
Which of the following statements are true?
a) The resistance of a conductor is proportional to the conductivity of the material of which the conductor is composed.
b) Good conductors of electricity have larger conductivity values than insulators.
c) A ma
B, C, E
If the voltage across a circuit of constant resistance is doubled, how is the current in the circuit affected?
a) The current remains constant.
b) The current is reduced by a factor of 4.
c) The current is doubled.
d) The current is quadrupled.
e) The cur
c, the current is doubled
If the resistivity of copper is less than that of gold at room temperature, which of the following statements must be true?
a) Electrons in gold are more likely to be scattered than electrons in copper at room temperature when they are accelerated by the
a) Electrons in gold are more likely to be scattered than electrons in copper at room temperature when they are accelerated by the same electric field.
As additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected?
a) The power supplied by the sources remains constant.
b) The power supplied by the source increases.
c) The power supplied b
b) The power supplied by the source increases.
remember the light bulb experiments with parallel vs series light bulbs
A constant voltage is applied across a circuit. If the resistance in the circuit is doubled, what is the effect on the power dissipated by the circuit?
The power dissipated is quadrupled.
The power dissipated remains constant.
The power dissipated is redu
The power dissipated is reduced by a factor of 2.
P = V^2/R
A circuit maintains a constant resistance. If the current in the circuit is doubled, what is the effect on the power dissipated by the circuit?
The power dissipated remains constant.
The power dissipated is reduced by a factor of 2.
The power dissipated i
The power dissipated is quadrupled.
P = V^2/R
Which of the following will increase the resistance of a wire?
a) Increasing the cross-sectional area of the wire will increase the resistance of the wire.
b) Increasing the resistivity of the material the wire is composed of will increase the resistance
B, C, F
There is a single electron at a distance from the point charge. On which of the following quantities does the force on the electron depend?
Check all that apply.
a- the distance between the positive charge and the electron
b- the charge on the electron
c-
A, B, D
Coulomb's Law
F=k |q1 * q2| /r2
Electrostatic force cannot exist unless two charges are present.
There is a single electron at a distance from the point charge. On which of the following quantities does the electric field at the electron's position depend?
a- the distance between the positive charge and the electron
b- the charge on the electron
c- t
A, E
The electric field can be created by only one charge. The value of the electric field depends only on the charge producing the electric field and the distance from that charge.
Does the shape or size of an object affect the total electric flux coming out of that surface?
NO. Just as the shape of the surface does not affect the total electric flux coming out of that surface, its size does not make any difference in the total electric flux either. The only relevant quantity is the total enclosed charge.
As additional resistors are connected in series to a constant voltage source, how is the power supplied by the source affected?
a - The power supplied by the source increases.
b- The power supplied by the source decreases.
c- The effect on the power suppl
b- The power supplied by the source decreases.
?????
If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected?
a- The voltage remains constant.
b- The voltage is quadrupled.
c- The voltage is reduced by a factor of 4.
d- The voltage is doubled.
e-
e- The voltage is reduced by a factor of 2.
V=IR
What happens to the current supplied by the battery when you add an identical bulb in parallel to the original bulb?
a- The current is cut in half.
b- The current stays the same.
c- The current becomes zero.
d- The current doubles.
d- The current doubles.
In a series circuit with two identical bulbs, what happens to the remaining bulb when one is replaced with a wire?
a- The remaining bulb maintains the same brightness.
b- The remaining bulb gets dimmer.
c- The remaining bulb gets brighter.
d- The remainin
c- The remaining bulb gets brighter.
Consider three resistors with unequal resistances connected in parallel to a battery. Which of the following statements are true?
a- The equivalent resistance of the combination of resistors is less than the resistance of any one of the three resistors.
b
A,B, C
Consider three resistors with unequal resistances connected in series to a battery. Which of the following statements are true?
a- The equivalent resistance of the combination of resistors is less than the resistance of any one of the three resistors.
b-
B, C, D
Which of the following statements are true?
a- The sum of the changes in potential around any closed loop of a circuit must equal zero.
b- Kirchhoff's loop rule is based on the conservation of charge.
c- Kirchhoff's junction rule is based on the conservat
A, D