Quiz 3
A refrigerator draws 3.5 amps (A) of current while operating on a 120-v power line. If the refrigerator runs 50% of the time and electric power costs $0.12 per kWh, how much does it cost to run the refrigerator for a 30-day month?
$18
A 4.00-μF and a 6.00-μF capacitor are connected in series, and this combination is connected across a 48.0-volt potential difference. What is the approximate potential difference across each capacitor? Hint: (Use the charge found in the question above).
(4.0μF, 6μF): 29 v, 19 v
A 4.00-μF and a 6.00-μF capacitor are connected in series, and this combination is connected across a 48.0-volt potential difference. What is the charge on each capacitor?
1.15E-4 C
The circuit shown below pertains to the next three questions.
2 amps to the left
If the length of a wire is tripled and the diameter is doubled, what is the new resistance of the wire terms of the original resistance, R?
3R/4
What is the unknown EMF, E in the circuit above?
42 v
A cylindrical metal rod of length L and diameter D is connected across a battery having no internal resistance. An ammeter in the circuit measures the current to be I. If the diameter of the rod is doubled and everything else stays the same, what current will the ammeter read?
4I
What is the value of the resistance R in the circuit above?
5 Ω
A resistor R and another resistor 2R are connected in parallel across a battery. If heat is produced at a rate of 10 W in R, what is the rate of the heat produced in resistor 2R?
5W
At a point P, a distance d from a point charge, the potential (relative to infinity) is V, and the electric field magnitude is E. If you now move to a point S at which the potential is V/2, what is the electric field magnitude at point S?
E/4
Which of the following is the most accurate statement concerning electric potential energy?
Electric potential energy is the energy associated with a system of charges relative to an arbitrary position in space.
What is the most accurate statement concerning Kirchhoff's laws?
Kirchhoff's voltage (KVL) is based on the conservation of energy.
Which of the following is the most accurate statement concerning electric potential?
More than one of the statements are accurate
A parallel-plate capacitor having circular plates of radius R and separation d is held at a fixed position potential difference by a battery. If the plates are moved closer together while they are held at the same potential difference, which statement(s) is (are) accurate?
More than one of the statements are accurate.
In the circuit shown, all meters are ideal, connecting leads have zero resistance, and the battery has no internal resistance. Which of the following statements is/are accurate?
More than one of the statements are accurate.
If the potential (relative to infinity) due to a point charge is V at a distance R from this charge, what is the distance at which the potential (relative to infinity) is 2V?
R/2
When two point charges are at a distance R apart, their potential difference energy is -2.0 J. How far (in terms of R) should they be from each other so that their potential energy is -6.0 J?
R/3
A piece of wire has resistance R. It is cut into three pieces of equal length. The pieces are twisted together parallel to each other. What is the resistance of the resulting wire in terms of R?
R/9
Which of the following is the most accurate statement concerning capacitance?
The capacitance of a capacitor is dependent on the physical dimensions of the capacitor (i.e., the surface area of the plates, distance between the plates, material between the plates, etc.).
An electron is released between the plates of a charged parallel-plate capacitor very close to the right-hand plate. Just as it reaches the left hand-hand plate, its speed is v. If the distance between the plates is halved without changing the electric potential difference between them, what is the speed of the electron when it reaches the left-hand plate?
v
