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April 18, 2014

Homework Help: Physics

Posted by Annoyingmous on Wednesday, May 22, 2013 at 3:37pm.

The circuit below consists of three identical resistors each with resistance R=7 Ohm, two identical batteries with emfs E=9 V, and a capacitor with capacitance C=651 μF. The capacitor is initially uncharged at t = 0.


(a) After a very very long time, t≫RC, what is the current i1 (in A)?
i1=


(b) After a very very long time, t≫RC, what are the currents i2 and i3 (in A)?


i2=



i3=


(c) After a very very long time, t≫RC, what is the magnitude of the voltage (in V ) across the capacitor ?
VC=


(d) Assuming that the capacitor starts uncharged, how long will it take (in seconds) for the voltage across the capacitor to reach 3/4 of its maximum value?
t=

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