(II) In Fig. 19–69 (same as Fig. 19–20a), the total resistance is 15.0 kN, and the battery's emf is 24.0 V. If the time con- stant is measured to be 18.0 µs, calculate (a) the total capacitance of the circuit and (b) the time it takes for the voltage across R the resistor to reach 16.0 V after the switch C= is closed. FIGURE 19–69 Problem 54. S

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