1. A defibrillator is used to restart a person's heart after it stops beating. Energy is delivered to the heart by discharging a capacitor through the body tissues near the heart. If the capacitance of the defibrillator is 9.70 F and the energy delivered is to be 234 J, to what potential difference must the capacitor be charged?
2. It has only been fairly recently that 1.00-F capacitors have been readily available. A typical 1.00-F capacitor can withstand up to 4.70 V. To get an idea why it isn't easy to make a 1.00-F capacitor, imagine making a 1.00-F parallel plate capacitor using titanium dioxide ( = 90.0, breakdown strength 4.00 kV/mm) as the dielectric. Find the minimum thickness of the titanium dioxide such that the capacitor can withstand 4.70 V