1. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER Two 2.3 cm x 2.3 cm square aluminum electrodes are spaced 0.57 mm apart. The electrodes are connected to a 100 V battery. (a) What is the capacitance? PF (b) What is the magnitude of the charge on each electrode? nc 2. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER Initially, the switch in the figure below is open and the capacitor is uncharged. V = 9 V and C = 10 F. How much charge flows through the switch after the switch is closed? C Switch 3. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER A switch that connects a battery to a 15 JF capacitor is closed. Several seconds later you find that the capacitor plates are charged to +70 JC. What is the emf of the battery? 4. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER What potential difference (voltage) should you apply to a 13.0 UF capacitor in order to store 12.0 J of energy? 5. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER In open-heart surgery a small amount of energy will defibrillatort. Defibrillators rely on a charging and discharging capacitor to deliver an electrical pulse to the heartIn open-heart surgery a small amount of energy will defibrillatort. Defibrillators rely on a charging and discharging capacitor to deliver an electrical pulse to the heart. (a) What voltage is applied to the 8.21 uF capacitor of a heart defibrillator that stores 40.2 J of energy? KV (b) Find the amount of stored charge. mc 6. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER In a typical lightning strike, 2.7 C flows from a cloud to the ground in 0.16 ms. Using the definition of electrical current, what is the current for a typical lightning strike? A 7. [-/1 Points] DETAILS SERCPWA11 17.WA.002. MY NOTES ASK YOUR TEACHER A current of 2.4 A flows through a wire. Determine the number of electrons per second passing a given point in the wire. electrons 8. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER The wires in the figure below are all made of the same material. Rank in order, from largest to smallest, the resistances R1 to R5 of these wires (use only the symbols > or =, for example R1>R2=R3). 2 280 28 2 2 280 " 9. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER We want to make a 0.135 mm diameter tungsten filament in a light bulb with a resistance of 0.125 0 at 20.0.C. What is the cross-sectional area of the filament wire? HINT: It's best to convert the diameter to meters before you calculate the area. m2 How long should the filament be? The resistivity of tungsten at 20.0 C is 5.60 x 10-8 0 . m