Name: ________________________
Class: ___________________
Date: __________
ID: A
1
Final exam
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
constants
k
o
= 9.0x10
9
N m
2
/C
2
,
ε
o
=8.9x10
-12
C
2
/ Nm
2
,
µ
o
=4
π
x10
-7
T m/A,
e =1.6x10
-19
C
c=3.0x10
8
m/s,
____
1.
The impedance of a 120
Ω
resistor, a 33
µ
F capacitor, and an 80 mH inductor in series and connected across
a 115 V ac wall outlet is:
a.
60
Ω
b.
80
Ω
c.
120
Ω
d.
130
Ω
e.
None of the above
____
2.
The secondary of a transformer has a resistor which is dissipating 1.8 W (rms) when a 120 V emf (peak) is
applied to the primary. If the resistor is 10
Ω
, the turns ratio of the transformer (
N
p
/
N
s
) is:
____
3.
In an LCR circuit connected to a 60 Hz 115 V AC source, the capacitive reactance is four times the inductive
reactance. The resonance frequency of the circuit is:
____
4.
A series circuit with
R
= 96
Ω
,
L
= 16 mH, and
C
= 4.0
µ
F is connected to a 12 V (peak value) AC source
with variable frequency. What is the rms current in the circuit at the resonance frequency?
____
5.
The waves, emitted by a distant radio station, reaching a point have an electric field with an amplitude of 3.0
×
10
-3
V/m. The amplitude of the magnetic field is:
a.
3.0
×
10
-11
T
b.
2.0
×
10
-11
T
c.
1.0
×
10
-11
T
d.
3.0
×
10
-12
T
e.
None of the above

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