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Figure P 18.37 shows a simplified model of a cardiac defibrillator, a device used to resuscitate patients in ventricular fibrillation. When the switch $\mathrm{S}$ 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 $R_{\text { torroo }}$ allowing the heart's normal rhythm to be reestablished. (a) If the capacitor is initially uncharged with $C=8.00 \mu \mathrm{F}$ and $\boldsymbol{E}=1250 \mathrm{V}$ , find the value of $R$ required to charge the capacitor to a voltage of 775 $\mathrm{V}$ in 1.50 $\mathrm{s}$ . (b) If the capacitor is then discharged across the patient's torso with $R_{\text { toorso }}=1250 \Omega$ , calculate the voltage across the capacitor after 5.00 $\mathrm{ms} .$

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Cornell University

Numerade Educator

University of Washington

University of Sheffield

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