10 points!!!,Electronics and Circuits Problem?

H

Huck

New member
Please help me solve this problems.. about Inductance and Capacitance...

I'll give 10 points to the best and first to answer the problems...

tnx in advance...

here are the problems :


1.) A capacitance of 2.0 micro-Farad with an initial charge Qo is switched into a series circuit consisting of a 10.0 ohms resistance.
Find Qo if the energy dissipated in the resistance is 3.6 mJoules.





2.) An inductance of 4.0 milli-Henries has a voltage
V= ( 2.0e^ (-10^ (3t) ) (v). Obtain the maximum stored energy. When will the current be zero??


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Tnx...
 
1. we know, energy E= VQ
= (Q/C)Q
= (Q^2)/C
here, E=3600000 J
C=2*10^-6 F
Q=?

Q= (CE)^.5
= (.000002*3600000)^.5 Coulombs
= (7.2)^.5
= 2.683281573 Coulombs



2. V= Li
2e^(-1000^t)=.004i
500e^(-1000^t)=i
=i
if i=0, t=infinity
energy,E=1/2 Li^2
=(1/2)* .004*(500/e^(1000^t))^2
E max when t=0
 
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