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img067 - PHY2054 Spring 2007 6 In the circuit/343m the...

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Unformatted text preview: PHY2054 Spring 2007 6. In the circuit/343m, the internal resistance of the battery is 0.10 and the capacitors are ini- ‘6‘)“ tially unchargef The current (in A) flowing in the 69 resistor an Mt afier the switch is {(5 closed is can it; (2) 4.9 .4” (3) 3.9 C (4) 3.3 (5) zero Immediately afier the switch is closed, the capacitors play no role and the current is determined solely by the battery and the resistors We obtain I =4 20 / 8.1 52.5 A. 7. For the above circuit, the switch is Mr 31W What is the charge (in microC) on the lower capacitor? ‘ @315 / 4. W3 Nikki“? 18.4 Q~ : \. ,p (3) 50.0 ox Q; (4) 25.0 \ (5) zero The final charge on each capacitor is obtained fi'om Q = CqV, where C8,, is the equivalent ca- pacitance of 2. 5 ,uF. This yields a final charge of 5 0pC. However, the charge builds up according to the relation the final charge fort = z is 50 r (1 — I/e) = 31.6,uC. 8. For the above situation [switch opened afier t = 1 time constant] what current (in A) flows through the 6-ohm resistor? 69m (2) 2.5 (3) 4.9 (4) 3.3 (5) 3.9 Since the switch is opened after one time constant, the current becomes zero. ...
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