Discharging of capacitor with another capacitor at time t

  • Thread starter Thread starter cupid.callin
  • Start date Start date
  • Tags Tags
    Capacitor Time
Click For Summary
SUMMARY

The discussion focuses on the discharge of one capacitor into another capacitor at time t, specifically using the equation Q/2(1 - e^(-2t/RC)). The conservation of charge principle is applied, indicating that the total charge remains constant. The relationship between the voltages across the resistive and capacitive components is established through the equation Q1/C1 = I*R + Q2/C2. A differential equation is derived to describe the system's behavior, emphasizing the initial condition Q2(0)=0.

PREREQUISITES
  • Understanding of capacitor discharge principles
  • Familiarity with differential equations
  • Knowledge of the conservation of charge in electrical circuits
  • Basic concepts of resistive and capacitive circuits
NEXT STEPS
  • Study the derivation of the differential equation for capacitor discharge
  • Learn about the implications of the conservation of charge in electrical systems
  • Explore the behavior of RC circuits under different initial conditions
  • Investigate the applications of capacitor discharge in real-world electronic circuits
USEFUL FOR

Electrical engineers, physics students, and anyone interested in understanding capacitor behavior in circuits will benefit from this discussion.

cupid.callin
Messages
1,130
Reaction score
1
1. The problem statement and my attempt
<pic>

Its not the correct answer.
answer is: Q/2(1 - e-2t/RC)
 

Attachments

  • Q1.jpg
    Q1.jpg
    18.9 KB · Views: 440
  • A1.jpg
    A1.jpg
    25.7 KB · Views: 468
Physics news on Phys.org
Use conservation of charge; there's nowhere for it to escape to!
 
The sum of the voltages across R and C2 is equal to the voltage of the first capacitor. Q1/C1 =I*R +Q2/C2. As the charge is conserved, Q1+Q2=Qo=const, and I=dQ2/dt=-dQ1/dt, so you have the differential equation (Qo-Q2)C1+Q2/C2+RdQ2/dt=0 with the initial condition Q2(0)=0.

ehild
 

Similar threads

Replies
20
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
9
Views
2K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 15 ·
Replies
15
Views
896
  • · Replies 14 ·
Replies
14
Views
1K
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K