RC circuit and kirchoff's loop rule

  • Thread starter okgo
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Let's see here, it can't be a because the cap isn't in parallel with the battery. A capacitor has infinite impedance at DC, so after an infinite time it can be modeled as an open circuit.

So loop 1)
Vb-Vc-IR=0
Loop 2)
Vb-2IR=0

combine to get
Vb-Vc-Vb/2=0

so
Vc=Vb/2

Vc=Q/C

so Vb/2=Q/C

Q=C*Vb/2

Voila.
 

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