Final_exam - Name Class Date ID A Final exam Multiple...

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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 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 b. 80 c. 120 d. 130 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 , 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 , 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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