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Question 4 Physics Electricity


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4) RLC circuit (40 points) An RLC circuit has a resistance R = 100 9, an in—
ductance L : 1H and a capacitor of unknown capac-
itance C. After the capacitor is fully charged and the
circuit is closed a damped oscillation with angular speed
we 2 271' f0 is observed, Where the frequency is f0 = 20 Hz. R L C a: What is the inductance C? (12 points) b: The energy stored in the magnetic field within the
inductor is maximal (5 points) 1. When the voltage reaches its maximum D 2. When the current reaches its maximum D
4.SORU2.jpg
3. when the change of the current is maximal O
4. when the energy stored in the electric field is max-
imal O
Now the same RLC combination is connected to a stan-
dard AC power source with a frequency of f = 50 Hz and
voltage AVrms = 220 V.
1000
R
L
C
c: What is the impedance Z of the RLC circuit? (12
points)
d: What is maximum current in the circuit and which
circuit element limits it the most? (7 points)
e: If the frequency of the power source would be fa, the
current would be ... (4 points)
1. smaller 0 3. the same
2. bigger 0 4. impossible to determine

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Subject: Physics, Science

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