Equivalent resistance for 2 resistors in parallel:
Equivalent resistance for resistors in series:
For 2 capacitors in series, the equivalent capacitance is::
For capacitors in parallel, the equivalent capacitance is:
The decay equation for current:
The equivalent resistance:
Req = 8 + (30)(20)/(30 + 20) = 20Ω
At what time has the current in the 8 Ω resistor decayed to half the value it had immediately after the switch was closed?
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