The current i amperes flowing in a
capacitor at time t seconds is given by
i =8.0(1−e−t CR ), where the circuit resistance R is
25×103 ohms and capacitance C is
16×10−6 farads. Determine (a) the current i after
0.5seconds and (b) the time, to the nearest
millisecond, for the current to reach 6.0A. Sketch
the graph of current against time.