When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rtorso, allowing the heart's normal rhythm to be reestablished.   (a) If the capacitor is initially uncharged with C = 7.75 µF and  = 1220 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 765 V in 1.70 s.   Ω (b) If the capacitor is then discharged across the patient's torso with Rtorso = 1230 Ω, calculate the voltage (in V) across the capacitor after 5.50 ms.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter18: Direct-Current Circuits
Section: Chapter Questions
Problem 37P: Figure P18.37 shows a simplified model of a cardiac defibrillator, a device used to patients in...
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When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rtorso, allowing the heart's normal rhythm to be reestablished.
 
(a)
If the capacitor is initially uncharged with C = 7.75 µF and  = 1220 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 765 V in 1.70 s.
  Ω
(b)
If the capacitor is then discharged across the patient's torso with Rtorso = 1230 Ω, calculate the voltage (in V) across the capacitor after 5.50 ms.
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