(a) Compute the charge on the capacitor justbefore the switch is thrown from pos

Question

(a) Compute the charge on the capacitor justbefore the switch is thrown from position 2 back to position 1.
1 C

(b) Compute the voltage drops across the resistor and across thecapacitor at the instant described in part (a).
Across the resistor.
2 V
Across the capacitor.
3 V

(c) Compute the voltage drops across the resistor and across thecapacitor just after the switch is thrown from position 2 back toposition 1.
Across the resistor.
4 V
Across the capacitor.
5 V

(d) Compute the charge on the capacitor 65.0 ms after the switch is thrown from position 2back to position 1.
6 C

Explanation / Answer

(a) Compute the charge on the capacitor justbefore the switch is thrown from position 2 back to position 1.
Q = C(1 - e-t/) = 8.29*10-4 C

(b) Compute the voltage drops across the resistor and across thecapacitor at the instant described in part (a).
  
Vr = Vc = Q/C = 20.7 V

(c) Compute the voltage drops across the resistor and across thecapacitor just after the switch is thrown from position 2 back toposition 1.
  
Vr = - 20.7 = 4.3 V
Vc = 20.7 V

(d) Compute the charge on the capacitor 65.0 ms after the switch is thrown from position 2back to position 1.
Q' = C(1 - e-2t/) = 9.71*10-4C

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