16. The electric potential energy stored in the capacitor of a defibrillator is

Question

16. The electric potential energy stored in the capacitor of a defibrillator is 70 J, and the capacitance is 114

The inner and outer surfaces of a cell membrane carry a negative and a positive charge, respectively. Because of these charges, a potential difference of about 0.076 V exists across the membrane. The thickness of the cell membrane is 8.50 times 10-9 m. What is the magnitude of the electric field in the membrane? The electric potential energy stored in the capacitor of a defibrillator is 70 J, and the capacitance is 114 mu F. What is the potential difference that exists across the capacitor plates?

Explanation / Answer

13)

E = V/d = 0.076/8.5*10^-9 = 8.94*10^6 volts

16)

U = 0.5*C*V^2

V = sqrt(2*U/C)

= sqrt(2*70/114*10^-6)

= 1108.2 volts

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