Question

A portable defibrillator containing an 85 ?F capacitor is charged up to a potential difference of...

A portable defibrillator containing an 85 ?F capacitor is charged up to a potential difference of 8000 V.

a) How much energy is stored in the device? What kind of energy is this stored energy?

b. How much positive charge is on one plate of the capacitor when it is fully charged? What is the net charge on both plates? Explain why this is the case.

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Answer #1

Capacitance of the capacitor is

Potential difference across the capacitor is V = 8000V

(a)

The energy stored in the capacitor is

The energy stored is electric potential energy.

(b)

The charge on the positive plate of the capacitor is

0.68 Coulombs is also the magnitude of charge on each plate. The net charge on both plates is zero. The reason is that the charge on one plate is +0.68 Coulombs while the charge on another plate is -0.68 Coulombs. The net charge on both plates is

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