Question 21 pts
Chap 20: Two identical circular coils of wire re separated by a fixed center-to-center distance. Their mutual inductance is minimized when the coils are perpendicular to each other.
Group of answer choices
True
False
Question 31 pts
Statement for Q3-Q5:
Chap 20: A metal rod of length L, like the one shown in figure below, moves to the right at speed (v) in a magnetic filed (B) directed into the page.
(a). What is the current (I) in the rod?
Group of answer choices
I = vBL/R
not enough information provided to answer.
I = P^2 / R
I = vBL
Question 41 pts
(b). In what direction does the current flow in the figure when the metal rod moves to the right?
Group of answer choices
not enough information provided to answer.
counter-clock-wise
clock-wise
Question 51 pts
(c). What is the direction of the magnetic force on the rod?
Group of answer choices
right
down
left
up
Question 61 pts
(d). What is the magnitude of the magnetic force on the rod?
Group of answer choices
vBLR
vBL2R
vB2L2R
vB2LR
Question 71 pts
The armature of an AC generator is a rectangular coil 2 cm by 6 cm with 80 turns. It is immersed in a uniform magnetic field of magnitude 0.5 T. If the amplitude of the EMF in the coil is 17V, at what angular speed is the armatures rotating?
Group of answer choices
3.9 rad/s
39 rad/s
390 rad/s
3900 rad/s
Question 81 pts
Statement for Q8 – Q9:
Chap 20:Two wire loops are side-by-side as shown in the figure. The current in loop one (I_1) is clockwise as viewed from the right and is supplied by an external source, which is not shown.
(a). While I_1 Is increasing does the current flow in loop 2? If so, does it flow clock-wise or counter-clock-wise?
Group of answer choices
yes, counter-clock-wise as viewed from the right.
yes, clock-wise as viewed from the right.
not enough information provided to answer.
no
Question 91 pts
(b). While the current in Loop one (I_1) Is constant, will current flow in loop 2? If so, will it flow clockwise or counterclockwise as viewed from the right?
Group of answer choices
no
not enough information provided to answer.
yes, counter-clock-wise as viewed from the right.
yes, clock-wise as viewed from the right.
Question 101 pts
(c). When the current in loop 1 is (I_1 = 0.75 A), the magnetic flux through loop 2 is 2.35 x 10-8 Tm2. What is the mutual inductance of the two loops?
Group of answer choices
3 x 10^{-8} H
4 x 10^{-6} H
1 x 10^{-7} H
5 x 10^{-5} H
Question 111 pts
(d). When the current in the loop one decreases at a steady rate of 28 A/s, the induced EMF in Loop two is 1.4 mV. What is the mutual inductance of the two loops?
Group of answer choices
3 x 10^{-8} H
1 x 10^{-7} H
4 x 10^{-6} H
5 x 10^{-5} H
Question 121 pts
A step down transformer has 400 turns on the primary and 200 turns on the secondary. If the primary voltage amplitude is 2.2 kV, What is the secondary voltage amplitude?
Group of answer choices
160 V
80 V
220 V
110 V
Question 131 pts
statement for Q 13 – Q 16:
A 5 mH inductor and a 10-ohm resister are connected in series with a 6V DC battery as shown in the figure:
(a). What is the voltage across the resistor immediately after the switch is closed?
Group of answer choices
6 V
3 V
0 V
12 V
Question 141 pts
(b). Voltage across resistor after switch has been closed for a long time?
Group of answer choices
6 V
0 V
12 V
3 V
Question 151 pts
(c) Current in inductor after switch has been closed for a long time?
Group of answer choices
12 A
0.6 A
3 A
6 A
Question 161 pts
Chap 22: EM waves consist of oscillating electric and magnetic field to propagate away from their source.
Group of answer choices
True
False
Question 171 pts
Chap 22: The speed of the EM waves when traversing through matter depends on the frequency of the wave.
Group of answer choices
True
False
Question 181 pts
Chap 22: What is the wavelength of the radio waves broadcast by an FM radio station with a frequency of 90.9 MHz?
Group of answer choices
4.5 m
1.4 m
2.6 m
3.3 m
Question 191 pts
Chap 22: How long does it take like to travel from this text to your eyes. Hint: Assume a distance a 50 cm.
Group of answer choices
3.45 ns
2.33 ns
1.67 ns
7.86 ns
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