# Two rocks have equal mass. Which has more gravitational potential energy? ```Two rocks have equal mass.
Which has more gravitational
potential energy?
A. Rock A.
B. Rock B.
C. They have the same potential energy.
D. Both have zero potential energy.
&copy; 2012 Pearson Education, Inc.
Slide 28-25
Two positive charges are equal.
Which has more electric
potential energy?
A. Charge A.
B. Charge B.
C. They have the same potential energy.
D. Both have zero potential energy.
&copy; 2012 Pearson Education, Inc.
Slide 28-28
Two negative charges are
equal. Which has more electric
potential energy?
A. Charge A.
B. Charge B.
C. They have the same potential energy.
D. Both have zero potential energy.
&copy; 2012 Pearson Education, Inc.
A and B are an electron and
proton respectively. Which has
more electric potential energy?
A. The electron A.
B. The proton B.
C. They have the same potential energy.
D. Both have zero potential energy.
&copy; 2012 Pearson Education, Inc.
A and B are two neutral
hydrogen atoms. Which has
more electric potential energy?
A. Atom A.
B. Atom B.
C. They have the same potential energy.
D. Both have zero potential energy.
&copy; 2012 Pearson Education, Inc.
A positive and a negative charge are
released from rest in vacuum. They
move toward each other. As they do:
A. A positive potential energy becomes more positive.
B. A positive potential energy becomes less positive.
C. A negative potential energy becomes more negative.
D. A negative potential energy becomes less negative.
E.
A positive potential energy becomes a negative potential
energy.
&copy; 2012 Pearson Education, Inc.
A positively charged object and a negatively charged
object are pulled away from one another. Then:
A. the electric potential energy increases.
B. the electric potential energy stays the same.
C. the electric potential energy decreases.
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The electric potential energy of two
point charges approaches zero as the
two point charges move farther away
from each other.
If the three point charges shown here
lie at the vertices of an equilateral
triangle, the electric potential energy
of the system of three charges is
Charge #2
+q
Charge #1
+q
y
A. positive.
B. B. negative.
C. zero.
D. not enough information given to decide
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x
–q
Charge #3
The electric potential due to a point
charge approaches zero as you move
farther away from the charge.
If the three point charges shown here
lie at the vertices of an equilateral
triangle, the electric potential at the
center of the triangle is
Charge #2
+q
Charge #1
+q
y
x
A. positive.
B. B. negative.
C. zero.
D. not enough information given to decide
&copy; 2012 Pearson Education, Inc.
–q
Charge #3
At the midpoint between these two
equal but opposite charges,
A. E  0; V = 0.
B. E  0; V &gt; 0.
C. E  0; V &lt; 0.
D. E points right; V = 0.
E. E points left; V = 0.
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At which point or points is the electric potential zero?
A.
B.
E. More than one of these.
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C.
D.
A positive charge moves as
shown. Its kinetic energy
A. Increases.
B. Remains constant.
C. Decreases.
&copy; 2012 Pearson Education, Inc.
Slide 28-35
An electron follows the
trajectory shown from point 1
to point 2. At point 2,
A.
v 2 &gt; v 1.
B.
v 2 = v 1.
C.
v 2 &lt; v 1.
D.
Not enough information to compare the
speeds at these points.
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Two protons, one after the other,
are launched from point 1 with the
same speed. They follow the two
trajectories shown. The protons’
speeds at points 2 and 3 are related
by
A.
B.
C.
D.
v2 &gt; v3 .
v2 = v3 .
v2 &lt; v3 .
Not enough information to compare their speeds.
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Two conducting spheres, one charged other neutral
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If a positive charge is released from rest, it moves in
the direction of
A. A stronger electric field.
B. A weaker electric field.
C. Higher electric potential.
D. Lower electric potential.
E. Both B and D.
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A proton is released from
rest at the dot. Afterward,
the proton
A. Remains at the dot.
speed.
C. Moves upward with an increasing speed.
D. Moves downward with a steady speed.
E.
Moves downward with an increasing speed.
&copy; 2012 Pearson Education, Inc.
&copy; 2012 Pearson Education, Inc.
Slide 28-35
The electric potential energy of two
point charges approaches zero as the
two point charges move farther away
from each other.
If the three point charges shown here
lie at the vertices of an equilateral
triangle, the electric potential energy
of the system of three charges is
Charge #2
–q
Charge #1
+q
y
x
A. positive.
B. B. negative.
C. zero.
D. not enough information given to decide
&copy; 2012 Pearson Education, Inc.
–q
Charge #3
Consider a point P in space where the electric potential is zero.
Which statement is correct?
A. A point charge placed at P would feel no electric force.
B. The electric field at points around P is directed toward P.
C. The electric field at points around P is directed away from P.
D. none of the above
E. not enough information given to decide
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Metal spheres 1 and 2 are
connected by a metal wire. What
quantities do spheres 1 and 2
have in common?
A.
Same potential.
B.
Same electric field.
C.
Same charge.
D.
Both A and B.
E.
Both A and C.
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Two identical balloons are connected after blowing one
&frac14; its maximum volume. When the valve is turned so
air can equalize between the two balloons
(a) The balloons will become equal in size.
(b) The large balloon will become a bit smaller, the
small balloon a bit bigger.
(a) The large balloon will become bigger, the small
balloon smaller.
(a) Nothing will happen.
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At the midpoint between these two
equal but opposite charges,
A. E  0; V = 0.
B. E  0; V &gt; 0.
C. E  0; V &lt; 0.
D. E points right; V = 0.
E. E points left; V = 0.
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Where is the electric potential zero?
A.
B.
C.
D.
E. More than one of these.
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&copy; 2012 Pearson Education, Inc.
Estimate E along shortest path between two
equipotential contours.
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A particle follows the
trajectory shown from
initial position i to final
position f. The potential
difference V is
A.
100 V.
B.
50 V.
C.
0 V.
D. 50 V.
E. 100 V.
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A proton is released from
rest at the dot. Afterward,
the proton
A. Remains at the dot.
B. Moves upward with steady speed.
C. Moves upward with an increasing speed.
D. Moves downward with a steady speed.
E. Moves downward with an increasing speed.
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Which set of equipotential surfaces
matches this electric field?
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This is a graph of the x-component of
the electric field along
the x-axis. The potential
is zero at the origin. What
is the potential at x  1m?
A.
B.
C.
2000 V.
1000 V.
0 V.
D. 1000 V.
E. 2000 V.
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At which point is the electric field stronger?
A. At xA.
B. At xB.
C. The field is the same strength at both.
D. There’s not enough information to tell.
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An electron is released from rest at x  2 m in the potential shown.
What does the electron do right after being released?
A. Stay at x  2 m.
B. Move to the right ( x) at steady speed.
C. Move to the right with increasing speed.
D. Move to the left (x) at steady speed.
E. Move to the left with increasing speed.
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The electric field at the dot is
A.
10&icirc; V/m.
B. 10&icirc; V/m.
C.
20&icirc; V/m.
D.
30&icirc; V/m.
E. 30&icirc; V/m.
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Metal wires are attached to
the terminals of a 3 V battery.
What is the potential
difference between points 1
and 2?
A. 6 V.
B. 3 V.
C. 0 V.
D. Undefined.
E. Not enough information to tell.
&copy; 2012 Pearson Education, Inc.
What is the electric field magnitude E at point 5?
(a)
(b)
(c)
(d)
(e)
&copy; 2012 Pearson Education, Inc.
0 N/C
1500 N/C
3000 N/C
6000 N/C
Not enough information
```