Physics 1B Quiz 3 Practice Quiz
(1) A 200.0 Ω resistor is constructed by forming a material of resistivity 2.5 Ω-m. The crosssection of this resistor is shaped like a square with side length d. The resistor is 1.5 cm
long. What is the value of the side length d? (c)
(a) 0.19 mm
(b) 3.0 mm
(c) 1.4 cm
(d) 7.3 cm
(e) 1.2 m
(2) A real battery marked 18.0 V is attached to a 6.0 ohm resistor.
The current is then measured to be 2.7 A. What is the internal
resistance of the real battery? (c)
a) 0.0 Ω
b) 0.3 Ω
c) 0.7 Ω
d) 1.8 Ω
e) 6.7 Ω
(3) What is the resistance from point A to point B in this circuit?
(a) [Nothing this difficult will be on the quiz, if you can get this you are a resistor master]
(a)
(b)
(c)
(d)
(e)
5Ω
10 Ω
20 Ω
40 Ω
80 Ω
(4) Which of the following is true about the circuit shown
containing resistors Ra, Rb, and Rc? (d)
a. All resistors in the circuit (Ra, Rb, and Rc) are
connected in parallel.
b. None of the resistors are connected in parallel.
c. Only resistors Ra and Rb are connected in parallel.
d. Only resistors Rb and Rc are connected in parallel.
e. Only resistors Ra and Rc are connected in parallel.
(5) In the picture to the right, the current through the 3.0 Ω resistor is 2.0 A. What is the
potential difference of the battery marked ɛ? (e)
a) 2.0 V
b) 4.0 V
c) 5.0 V
d) 6.0 V
e) 8.0 V
(6) The light bulbs and batteries in the two circuits are identical. Compare B1 the total
brightness produced by circuit 1, with B2 the total brightness produced by circuit 2. (c)
(a) B1 < B2
(b) B1 = B2
(c) B1 > B2
This and the next question are about the following situation:
Consider the circuit shown to the right.
(7) Which of the following is a valid Kirchhoff voltage equation for the dotted outside loop?
(c)
(a) E1 + I1R1 - E2 + I3R3 = 0
(b) -E1 + I1R1 + E2 - I3R3 = 0
(c) E1 - I1R1 - E2 - I3R3 = 0
(8) The circuit elements have the values shown in the table below.
Calculate VAB = VA- VB, the potential difference between point A and point B? (d)
(a) VAB = 20 Volts
(b) VAB = 10 Volts
(c) VAB = 0 Volts
(d) VAB = -10 Volts
(e) VAB = -20 Volts
The next four problems concern this circuit.
(9) How much power is being delivered by the battery? (d)
(a)
(b)
(c)
(d)
(e)
(10)
P = 1.95 W
P = 5.32 W
P = 11.9 W
P = 25.8 W
P = 28.8 W
Compare I2, the current through R2, with I3, the current through R3. (a)
(a) I2 > I3
(b) I2 = I3
(c) I2 < I3
(11)
Compare V3, the voltage across R3, with V4, the voltage across R4. (c)
(a) V3 > V4
(b) V3 = V4
(c) V3 < V4
(12)
(a)
(b)
(c)
(d)
(e)
What is I2, the current through R2? (b)
I2 = 0.248 A
I2 = 0.387 A
I2 = 0.459 A
I2 = 0.521 A
I2 = 0.692 A
(13)
In the circuit below what is the magnitude of the potential difference between
points A and B ?
(a)
(b)
(c)
(d)
(e)
|VAB| = 0 volts
|VAB| = 10 volts
|VAB| = 20 volts
|VAB| = 30 volts\
|VAB| = 40 volts
(14)
In the circuit shown below (note that the resistances of these bulbs may not be the
same).(b)
(a) the 25 watt bulb and the 100 watt bulb have the same brightness.
(b) the 25 watt bulb is brighter than the 100 watt bulb.
(c) the 100 watt bulb is brighter than the 25 watt bulb.
(15)
(a)
(b)
(c)
(d)
(e)
What is I2, the current through resistor #2? (a)
I2 = 0.216 A
I2 = 0.388 A
I2 = 0.459 A
I2 = 0.521 A
I2 = 0.693 A
This and the next three questions are about the following situation:
In the circuit shown below, the battery emf is 12 volts, the resistors R1 = 3 Ω, R2 = 3Ω,
and the capacitor C = 6 µF. The capacitor is initially uncharged. The circuit is connected
as shown below, then switch S1 is closed, while S2 is left open.
(16)
Immediately after switch S1 is closed, what is the current in resistor R1? (c)
(a) I1 = 0 A
(b) I1 = 2 A
(c) I1 = 4 A
(17)
Immediately after switch S1 is closed, what is the current in resistor R2? (a)
(a) I2 = 0 A
(b) I2 = 2 A
(c) I2 = 4 A
(18)
After a long time, switch S1 is opened, and switch S2 is closed.
After switch S2 is closed, what happens to the charge on capacitor C? (b)
(a) The capacitor discharges through resistor R1.
(b) The capacitor discharges through resistor R2.
(c) The capacitor discharges through resistors R1 and R2.