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74. 59. 55. ¢¢ A 0.25 uF capacitor is charged to 50 V. It is then connected in series with a 25 Q resistor and a 100 Q resistor and allowed to discharge completely. How much energy is dissipated by the 25 Q resistor? ¢¢ The capacitors in Figure P28.74'9 are charged and the switch closes at t = 0s. At what time has the current in the 8 Q resistor decayed to half the value it had immediately after the switch was closed? Figure P28.74 8a Loo Lone 200 (Veh =10V Louw 00 ¢¢ For the circuit shown in Figure P28.59", find the current through and the potential difference across each resistor. Place your results in a table for ease of reading. Figure P28.59 40 8a no ¢ What are the battery current I, and the potential difference V, — V, between points a and b when the switch in Figure P28.55 is (a) open and (b) closed? Figure P28.55 + 3a Ssa 4v=S ap" 46. 45. °° What are the emf and internal resistance of the battery in Figure P28.465? Figure P28.46 ¢ What is the equivalent resistance between points a and b in Figure P28.45? Figure P28.45 20 na 6a 40 100 
