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7" ,' $.%,5) change
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6,$&)%+) *6,)%&*A /6'. '64)
B) increase linearly with time
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C) decrease linearly with time
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0)$&)%+) increase quadratically'64) time
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!"#$%&' ()* +,.!/+0, 1, +,.!/1,!2 10. An LC circuit has an inductance of 15 mH and a capacitance of 10 µF. At one instant,
the charge on the capacitor is 25 µC. At that instant, the current is changing at a rate
of: ""#
10. A) 0
B) 1.7 × 10−8 A/s
C) 5.9 × 10−3 A/s
D) 3.8 × 10−2 A/s
E) 170 A/s 11. The primary coil of an ideal transformer has 100 turns and the secondary coil has 600
turns. Then: 11. A) the power in the primary circuit is less than that in the secondary circuit
B) the currents in the circuits are the same
C) the voltages in the two circuits are the same
D) the primary current is six times that of the secondary current
E) the frequency in the secondary circuit is six times that in the primary circuit 12. In an ideal 8:1 stepdown transformer, the primary power is 10 kW and the RMS secondary current is 25 A. The primary RMS voltage is:
A) 26,600 V
B) 3200 V
C) 400 V
D) 50 V
E) 6.25 V 5 12. FREE RESPONSE. Write your answers in the boxes provided, using the units given. You may
receive partial credit for work that is shown clearly. (10 points each)
13. In the circuit shown below, the switch S is open and there is no charge on the capacitor. (A) Find the current in each ammeter just after S is closed.
I1 = A (1) I2 = A (1) I3 = A (1) I4 = A (1) I1 = A (1) I2 = A (1) I3 = A (1) I4 = A (1) Q= C (2) (B) Find the current in each ammeter a long time after S is closed. (C) What is the maximum charge on the capacitor? 6 14. This one should be familiar, but it’s simpler than what we did in class. You want to build an RLC circuit
that will act as a simple radio. The radio should be tuned to Vanderbilt’s own WRVU, which broadcasts
at 91.1 MHz.
(A) Calculate the angular frequency of WRVU.
rad
s ω= (2) (B) If the capacitor in your circuit has a value of 10 pF, what is your circuit’s capacitive reactance at the
WRVU frequency?
XC = Ω (2) (C) What should the value of your inductor be in order to match the resonant frequency of your circuit
to WRVU?
L= H (2) (D) Suppose the closest station to WRVU, StationX, broadcasts at 91.3 MHz. If the resistor in your
circuit has a value of 0.2 Ω, what will be the ratio of the power at StationX to the power at WRVU
in your circuit?
PStationX
PWRVU = 7 (4)...
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 Spring '07
 Haglund
 Physics

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