1. At what distance would be repulsive forces between two protons have a magnitude of 2.00 N? 2. If a proton and an electron are released when they are apart, find the initial acceleration of each of them. 3. A charge of 28.0 nC is placed in a uniform electric field that is directed vertically upward and that has a magnitude of . What work is done by the electric force when the charge moves 5.20 m at the angle 45 degrees downward from the horizontal? 4. Two large metal parallel plates carry opposite charges of equal magnitude. They are separated by 45.0 mm and the potential difference is 360 V. what is a magnitude of the uniform electric field in the region between the plates? 5. A point charge has the value. At what distance from the point charge is electric potential 90 V? 6. A parallel -plate air capacitor has a capacitance of 500.0 pF and a charge of magnitude on each plate. What a potential difference between the plates? 7. A and capacitors are connected in series, and this combination is connected across 48.0 V potential difference. Calculate: (a) equivalent capacitance, ( b) the charge on each capacitor, and (c) potential difference across each of them. 8. A and capacitors are connected in parallel, and this combination is connected across 48.0 V potential difference. Calculate: (a) equivalent capacitance, (b) potential difference across each of them, and (c) the charge on each capacitor. 9. A parallel plate capacitor has capacitance pF when there is air between the plates. The separation between the plates is 1.50 mm. A dielectric with K=2.70 is inserted between the plates of the capacitor, completely feeling the volume between the plates. Find the magnitude of charge on each plate, when dielectric is inside capacitor, if the electric field between the plates in this case is