Closing a Circuit 24.89 Giancoli

  • Thread starter Thread starter vjk2
  • Start date Start date
  • Tags Tags
    Circuit
AI Thread Summary
In the discussion about closing a circuit with capacitors, a configuration is described where one capacitor (2.8 uF) is in parallel with two others (4.4 uF and 3.7 uF) that are in series. Initially, the 2.8 uF capacitor is charged while the others remain uncharged. When the switch is thrown, disconnecting the voltage source, the charge from the 2.8 uF capacitor is redistributed between it and the series combination of the other two capacitors. This results in a decrease in the charge on the 2.8 uF capacitor as it shares its charge with the series capacitors. Understanding the circuit's behavior hinges on recognizing the role of the switch and the redistribution of charge after disconnection from the voltage source.
vjk2
Messages
89
Reaction score
0
24.89 Giancoli

There are three capacitors. One is in parallel with two others. The two others are in series. The alone one is 2.8 uF, the other two in series are 4.4 and 3.7 uF. a 12 volt voltage is applied. Initially there is a bridge that connects to the 2.8. After it is charged, the switch is thrown. What are the final charges on each?

This one throws me because I'm not sure what happens after the switch is thrown. Does the voltage cease to be applied? or is it still applied? if it is still applied, then I'm not sure how the built-up charge in the 2.8uF capacitor matters.
 
Physics news on Phys.org
I can imagine a single capacitor in parallel with a series combination, but I cannot imagine what the "bridge" does or where the switch is. Can you post a circuit schematic?
 
GIANCOLI.ch24.p89.jpg
 
OK, I get it. With the switch to the left, C1 is fully charged and the other two are uncharged. When the switch is thrown to the right, the voltage source is disconnected and the charge that was initially on C1 is now shared by C1 and the series combination of C2 and C3. Obviously, C1 has less charge than before because some of it went to the series combination.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Why Do Capacitors Behave Differently in Series and Parallel Configurations?
Replies
20
Views
2K
How to calculate R1 and R2 in this RC circuit
Replies
3
Views
3K
Determining Inductance L in an LC Circuit
Replies
5
Views
2K
Final Charge of a Capacitor in a Circuit with Capacitors and Resistors
Replies
9
Views
2K
Total charge in a capacitive circuit
Replies
3
Views
2K
Why can we model spherical capacitor with two dielectrics as two capacitors in series?
Replies
4
Views
2K
Circuit with resistor, switch and capacitor
2
Replies
62
Views
5K
Electronic Circuits: Capacitors and switches
Replies
11
Views
2K
Find the unknown capacity of two capacitors
Replies
5
Views
1K
Capacitor in series voltage problem
Replies
19
Views
3K

Hot Threads

Recent Insights

Back
Top