A certain capacitor holds a charge of 38 nC when a voltage of 35 V is applied to it. a. What is the capacitance of this capacitor in Farads? b. How much energy is stored in this capacitor in Joules? F J

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In the figure, a proton is fired with a speed of 200,000 m/s from the midpoint of the capacitor toward the positive plate. a. Show that this is insufficient speed to reach the positive plate. b. What is the proton’s speed as it collides with the negative plate?

5. A capacitor is charged by a battery. It may or may not have been removed from this battery. A dielectric is then either inserted or removed from between the plates. The capacitance increased by a factor of 5 and the charge across the plates increased by a factor of 5. a. Was the capacitor on or off the battery? Explain. b. Was the dielectric inserted or removed from between the plates? Explain.