QUESTION 19 0 Consider an air-gaped parallel-plate capacitor (you can use & = 8.85 10-12 C/ (Nm) ). The capacitor has a capacitance of 20 nF and a charge of magnitude 0.49 mC on each plate. Then, the potential difference between the plates is V. Express answer in exponential format with 3 significant figures. QUESTION 20 Continuing with the previous question, if the plates are 0.58 mm apart, the area of each plate is m. Use normal format and 3 SF. QUESTION 21 Let's continue. If the capacitor is discharged and then connected to a 12.1 V battery, and the distance between the plates is changed to 1.00 mm, then the magnitude of the electric field between the plates is N/C. Use exponential format and 3 SF. QUESTION 22 The electric energy stored in a 20 nF capacitor charged by a 95.0 V battery is. J. Use exponential format and 3 SF.