a. A capacitor charging circuit consists of a battery, an uncharged 20 mF capacitor, and a 4.0 k_ resistor. At t = 0 s, the switch is closed; 0.15 s later, the current is 0.46 mA. What is the batterys emf? b. The switch in Figure P23.49 has been in position a for a long time. It is changed to position b at t = 0 s. What are the charge Q on the capacitor and the current I through the resistor (a) immediately after the switch is changed? (b) At t = 50 ms? (c) At t = 200 ms?
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