In a defibrillator (see Example 17.12), a charged capacitor is connected to paddles that make electrical contact with the patient's skin. If gel is applied to the patient's chest to make a good connection between the paddles and the skin, the effective resistance through which the capacitor discharges is 52.0 Ω. 

(a) To what voltage must the capacitor be charged to generate a maximum current of 40.0 A? 

(b) If the current 1.00 ms later is 10. 0 A, what is the capacitance? 

(c) Why does a paramedic shout “Clear!” before administering the shock?

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