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Unformatted text preview: GRANGE CO UNTRV SET 10 OR A NGE COU N'TRY
Phys 2114 instructor: Professor Bandy Fall 2011 1. a. A 111 Hz source of emf has a peak voltage of 50 V. Draw the emf phasor at 3.0 ms. b. Draw the
phasor for the emf g : (170 V) cos((_27rx60Hz)t) at t = 60 ms. 2. The peak current through a capacitor is 10.0 mA. What is the current if: a. the emf frequency is
doubled? b, the emf peak voltage is doubled (at the original frequency)? c. the frequency is halved and,
at the same time, the emfis doubled? @ a. A high~pass RC ﬁlter with a crossover frequency of 1000 Hz uses a 100 Q resistor. Calculate the
value of the capacitor. b. A lowpass RC ﬁlter with a crossover frequency of 1000 Hz uses a 100 .Q resistor. Calculate the value of the capacitor. 4. A 500 ,uH inductor is connected across an AC generator that produces a peak voltage of 5.0 V. a. At What frequency f is the peak current 50 mA? I). What is the instantaneous value of the emf at the instant
when iL = ‘IL? (Note: lower case i represents instantaneous current) 5. a. What inductor in series with a 100 Qresistor and a 2.5 ,sz capacitor gives a resonance frequency of
J 000 Hz? b. What capacitor in series with a 100 1‘2 resistor and a 20 mH inductor gives a resonance
frequency of 1000 Hz? A resistor dissipates 2.0 1‘2‘when the rms voltage of the emf is 10.0 V. At what rms voltage will the resistor dissipate 10. 0 k @ a. What is the peak current supplied by the emf in Fig. 1. b. What is the peak voltage across the
3 #F capacitor? c. Replace each capacitor with a resistor as in Fig. 2 and double 80. What is the average power supplied by the emf and what is the energy dissipated by each resistor? 93 a. A damped LC circuit consists of a 0.15 ,uF capacitor and a 20 W inductor with resistance
1.6 .Q How many cycles will the circuit oscillate before the peak voltage on the capacitor drops to half its initial value? b. A damped RLC circuit includes a 5.0 .Qresistor and a 100 mH inductor. If half the
initial energy is lost after 15 cycles, what is the capacitance? Figure 3 shows a rectangular loop of wire immersed in a nonuniform and varying magnetic ﬁeld
E? that is perpendicular to and directed into the page. The ﬁeld’s magnitude is given by
B : 412x2 , with B in Tesla, tin seconds and x in meters. The loop has width w = 3.0 m and
height h = 2.0 m. Calculate the magnitude and direction of the induced emf E around the loop at t y =0.103. 200 L? Figure 1 Figure 2 Figure 3 ) I l/ _ __ {a ‘
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 Spring '08
 Bandy

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