21. Set plate area set to 200 mm and plate separation set to 6 mm, and battery at +1.5 V, and charge capacitor. After charging, disconnect the capacitor from the battery (move to disconnect location; see figure 1). What are the values of capacitance, top plate charge, stored energy and measured voltage between the plates (you may have to reposition the voltage probes)? a. 0.30 pF, 0.44 pC, 0.33 pJ, and 1.5 V. b. 0.30 pF, 0.27 pC, 0.50 pJ, and 1.5 V. c. 0.44 pF, 0.66 pC, 0.50 pJ, and 1.5 V. d. 0.44 pF, 0.50 pC, 0.66 pJ, and 1.5 V. 22. With the capacitor disconnected from the battery (same procedure as in question 21), vary the plate area from 100 mm to 400 mm2, while keeping the plate separation distance the same. Which of the following variables remain constant (you may have to reposition the voltage probes)? a. Capacitance and charge remain constant, while stored energy and voltage between the plates change. b. Capacitance, charge, stored energy and voltage between the plates all change. c. Capacitance, charge, stored energy and voltage between the plates all remain the same. d. Capacitance, stored energy and voltage between the plates change while the charge remains constant.20. Consider the parallel plate capacitor with plate area of 200 mm and plate separation of 6 mm. The capacitor is connected to a battery in situation i) with the battery at 0 V and in situation ii) with the battery at +1.5 V. Which of the following statements best describe the comparison between situations i) and ii)? a. The capacitance is the same in both situations because Capacitance is proportional to Plate Area/separation distance, and in both situations plate area and separation distance are the same. Thus the electric field is also the same. b. The Capacitance is proportional to Plate Area/separation distance, and while these variables are the same in both situations, the electric field is not the same and thus Capacitance is not the same. c. The capacitance is the same in both situations because Capacitance is proportional to Plate Area/separation distance and these are the same in both situations. But, the electric field is not the same as the potential difference between the plates in each situation is different because the voltage supplied by the battery is not the same in both situations.23. With the capacitor disconnected from the battery (same procedure as in question 21), vary the plate separation distance from 2 mm to 10 mm, while keeping the plate area the same. Which of the following variables remain constant (you may have to reposition the voltage probes)? a. Capacitance and charge remain constant, while stored energy and voltage between the plates change. b. Capacitance, charge, stored energy and voltage between the plates all change. c. Capacitance, charge, stored energy and voltage between the plates all remain the same. d. Capacitance, stored energy and voltage between the plates change while the charge remains constant.18. With the capacitor connected to the battery which supplies a constant potential difference of 1.5 V, increase and decrease the plate area (range is 100 mm to 400 mm?) while keeping the plate separation distance the same. Which of the following variables remain constant (you may have to reposition the voltage probes)? a. Capacitance and charge remain constant, while stored energy and voltage between the plates change. b. Capacitance, charge, stored energy and voltage between the plates all change. c. Capacitance, charge, stored energy and voltage between the plates all remain the same. d. Capacitance, charge and stored energy change while the voltage between the plates remains constant. 19. With the capacitor connected to the battery which supplies a constant potential difference of 1.5 V, increase and decrease the plate separation distance (range is 2 to 10 mm) while keeping the plate area the same. Which of the following variables remain constant (you may have to reposition the voltage probes)? a. Capacitance and charge remain constant, while stored energy and voltage between the plates change. b. Capacitance, charge, stored energy and voltage between the plates all change. c. Capacitance, charge, stored energy and voltage between the plates all remain the same. d. Capacitance, charge and stored energy change while the voltage between the plates remains constant