Quick quizzes TCC
Terms in this set (12)
Three objects are brought close to each other, two at a time.
When objects A and B are brought together, they repel. When objects B and C are brought together, they also repel. Which of the following are true?
(a) Objects A and C possess charges of the same sign. (b) Objects A and C
possess charges of opposite sign. (c) All three objects possess charges of the
same sign. (d) One object is neutral. (e) Additional experiments must be performed
to determine the signs of the charges.
(a),(c), and (e)
Three objects are brought close to one another, two at a
time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. Which of the following are necessarily
(a) Objects A and C possess charges of the same sign.
(b) Objects A and C possess charges of opposite sign.
(c) All three objects possess
charges of the same sign.
(d) One object is neutral.
(e) Additional experiments
must be performed to determine information about the charges on
Object A has a charge of 12 mC, and object B has a charge
of 16 mC. Which statement is true about the electric forces on the objects?
(a) F(AB)= -F(BA)
A test charge of 13 mC is at a point P where an external electric
field is directed to the right and has a magnitude of (4*10^6) N/C. If the
test charge is replaced with another test charge of 23 mC, what happens to
the external electric field at P ?
a) It is unaffected. (b) It reverses direction.
(c) It changes in a way that cannot be determined.
Rank the magnitudes of the electric field at points A, B, and
C (greatest magnitude first). Picture in the phone
A,B and C
Suppose a point charge is located at the center of a spherical surface. The electric field at the surface of the sphere and the total flux through the sphere are determined. Now the radius of the sphere is halved.What happens to the flux through the sphere and the magnitude of the electric
field at the surface of the sphere?
(a) The flux and field both increase.
(b) The flux and field both decrease. (c) The flux increases, and the field
decreases. (d) The flux decreases, and the field increases. (e) The flux remains the same, and the field increases. (f) The flux decreases, and the
field remains the same.
If the net flux through a gaussian surface is zero, the following
four statements could be true. Which of the statements must be true?
(a) There are no charges inside the surface. (b) The net charge inside the
surface is zero. (c) The electric field is zero everywhere on the surface.
(d) The number of electric field lines entering the surface equals the number
leaving the surface.
b and d
Your younger brother likes to rub his feet on the carpet
and then touch you to give you a shock. While you are trying to escape the
shock treatment, you discover a hollow metal cylinder in your basement,
large enough to climb inside. In which of the following cases will you not be
(a) You climb inside the cylinder, making contact with the inner
surface, and your charged brother touches the outer metal surface. (b) Your
charged brother is inside touching the inner metal surface and you are outside,
touching the outer metal surface. (c) Both of you are outside the cylinder,
touching its outer metal surface but not touching each other directly.
In Figure 25.1, two points A and B are located within a region in which there is an electric field. (i) How would you describe the
potential difference V=V(A)-V(B)?
(ii) A negative charge is placed at A and then moved to B . How would
you describe the change in potential energy of the charge-field system for this process?
(a) It is positive.
(b) It is negative.
(c) It is zero
The labeled points in Figure 25.4 are on a series of equipotential
surfaces associated with an electric field. Rank (from greatest to least)
the work done by the electric field on a positively charged particle that moves from A to B , from B to C, from C to D , and from D to E.
B to C
C to D
A to B
D to E
In Active Figure 25.9a, take q1 to be a negative source charge
and q2 to be the test charge. (i) If q2 is initially positive and is changed to a charge of the same magnitude but negative, what happens to the potential at the position of q2 due to q1? ii) When q2 is changed from positive to negative, what happens
to the potential energy of the two-charge system?
(a) It increases. (b) It decreases. (c) It remains the same.
i) c ,ii) a
In a certain region of space, the electric potential is zero
everywhere along the x axis.
(i) From this information, you can conclude that the x component of the electric field in this region is?
(ii) Suppose the electric
potential is +2 V everywhere along the x axis. From the same choices, what
can you conclude about the x component of the electric field now?
(a) zero, (b) in the positive
x direction, or (c) in the negative x direction.
i)a, ii) a