Which one of the following statements is true concerning the spacing of the electric field lines in the vicinity of two point charges of equal magnitude and opposite sign?
A) The spacing indicates the direction of the electric field.
B) The spacing does not depend on the magnitude of the charge...
PHYSICS Chp 18, 19, 20
Comprehensive Q & A
Which one of the following statements is true concerning the
spacing of the electric field lines in the vicinity of two point
charges of equal magnitude and opposite sign?
A) The spacing indicates the direction of the electric field.
B) The spacing does not depend on the magnitude of the charges.
C) The spacing is large when the magnitude of the charges is
large.
D) The spacing indicates the relative magnitude of the electric
field.
E) The spacing is small when the magnitude of the charges is
small. - ✔ ✔ D) The spacing indicates the relative magnitude
of the electric field.
What is the total power dissipated in the two resistors in the
circuit shown?
10 V 10 ohm and 20 ohm parallel
A) 10 W
,B) 15 W
C) 33 W
D) 67 W
E) 670 W - ✔ ✔ B) 15 W
Some light bulbs are connected in parallel to a 120 V source as
shown in the figure. Each bulb dissipates an average power of 60
W. The circuit has a fuse F that burns out when the current in the
circuit exceeds 9 A. Determine the largest number of bulbs,
which can be used in this circuit without burning out the fuse.
A) 9
B) 17
C) 25
D) 34
E) 36 - ✔ ✔ B) 17
When a 1500-W hair dryer is in use, the current passing through
the dryer may be represented as I = (17.7 A) sin (120πt). What is
the rms current for this circuit?
A) 17.7 A
B) 12.5 A
C) 85.7 A
,D) 25.0 A
E) 8.85 A - ✔ ✔ B) 12.5 A
When a light bulb is connected to a 4.5 V battery, a current of 0.12
A passes through the bulb filament. What is the resistance of the
filament?
A) 440 Ω
B) 28 Ω
C) 9.3 Ω
D) 1.4 Ω
E) 38 Ω - ✔ ✔ E) 38 Ω
Which one of the following statements is true concerning the
strength of the electric field between two oppositely charged
parallel plates?
A) It is zero midway between the plates.
B) It is a maximum midway between the plates.
C) It is a maximum near the positively charged plate.
D) It is a maximum near the negatively charged plate.
E) It is constant between the plates except near the edges. - ✔
✔ E) It is constant between the plates except near the edges.
Which one of the following statements is true concerning the
work done by an external force in moving an electron at constant
speed between two points in an electrostatic field?
, A) The work done is always zero joules.
B) The work done is always positive.
C) The work done only depends on the speed of the electron.
D) The work done depends on the total distance covered.
E) The work done depends only on the displacement of the
electron. - ✔ ✔ E) The work done depends only on the
displacement of the electron.
. Two charged particles A and B are located near one another.
Both the magnitude and direction of the force that particle A
exerts on particle B is independent of
A) the sign of charge B.
B) the sign of charge A.
C) the distance between A and B.
D) the magnitude of the charge on B.
E) The magnitude and direction of the force are dependent on all
of the above choices - ✔ ✔ E) The magnitude and direction of
the force are dependent on all of the above choices
How much charge flows from one capacitor to the other when
the capacitors are connected?
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