Consider a heart defibrillator similar to that discussed in Example 19.11. Construct a problem in which you examine the charge stored in the capacitor of a defibrillator as a function of stored energy. Among the things to be considered are the applied voltage and whether it should vary with energy to be delivered, the range of energies involved, and the capacitance of the defibrillator. You may also wish to consider the much smaller energy needed for defibrillation during open-heart surgery as a variation on this problem.

Data given in Example 19.11

A heart defibrillator delivers 4.00 x 10² J of energy by discharging a capacitor initially at 1.00 x 10⁴ V. What is its capacitance?

Strategy

We are given E_cap and V, and we are asked to find the capacitance C. Of the three expressions in the equation for E_cap, the most convenient relationship is

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