The immediate cause of many deaths is ventricular fibrillation, which is an unco

Question

The immediate cause of many deaths is ventricular fibrillation, which is an uncoordinated quivering of the heart. An electric shock to the chest can cause momentary paralysis of the heart muscle, after which the heart sometimes resumes its proper beating. One type of defibrillator photo below applies a strong electric shock to the chest over a time interval of ? few milliseconds. This device contains a capacitor of several microfarads, charged to several thousand volts. Electrodes called paddles are held against the chest on both sides ot the heart, and the capacitor is discharged through the patient's chest. Assume an energy of 250 3 is to be delivered from a 30.0 uF capacitor. To what potential diftterence must it be charged?

Explanation / Answer

Energy stored in capacitor is given by,

E = 0.5 CV2

V = sqrt (2E/C)

V = sqrt ((2 x 250) / (30 x 10-6)) = 4082.48 V

So, potential difference is 4082.48 V.

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