having lots of trouble with a few problems that are due tonight...please help!!! 1. A 0.28F capacitor is desired. What area must the plates have if they are to be separated by 1.2mm air gap? I used C=E0 (A/d) and I keep getting the same and wrong answer. What am I doing wrong? 2. What potential difference acting over a distance of 3.5cm would be needed to balance the downward force of gravity so that an electron would remain stationary? Assume the electric field is uniform. I used V=mass of electron*gravity*0.035m/1.6*E-19, and that gave me the wrong answer. Help anyone. 3. A 9.4V battery is connected to a bulb whose resistance is 2.1ohms. How many electrons leave the battery per minute. I used ohm's law I=9.4/2.1 to get the current 4.476C/s. Then I multiplied 4.476c/s*60s/1.6E-19 and got 1.68E-17 electrons/minute...and that answer was wrong...any help?