Do you see red I, I want to discuss about current after switch is closed? Immediately after closing.Ok, at which point in the circuit do you want to discuss? You have parallel and series in this circuit. Current will not be equal everywhere. So, what point are you interested in?
So you want the current through the switch then, and is the polarity the same as that arrow?
I ask because the normal conventional current flow would be down not up, but either way is ok as long as you understand the difference.
My question is, do you know how to calculate the steady state current or cap voltage BEFORE the switch is closed? That is, assuming the 100ma current had been flowing for a very long time. That would be the starting point.
Total resistance is R1||(R2+R3).Then assume the capacitor is not there
So, first step is to calculate the
Series resistance of the one parallel leg.
Then calculate the total resistance seen by the current source.
, and then do the calculation of the voltage at each node.
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