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A series circuit has a DC voltage source (42 volts), a resistor (70 ohms), a capacitor...

A series circuit has a DC voltage source (42 volts), a resistor
        (70 ohms), a capacitor (25 farads), and a switch.  The capacitor is
        initially uncharged and the switch closes at t=0. Sketch the exponential
        current and capacitor voltage: i(t)=Aexp(-t/tau) +B, and
        Vc(t)=Dexp(-t/tau) +F.
        Find: A,B,D,F,tau,i(t=tau),i(t=4tau),Vc(t=tau),and Vc(t=3tau).
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