Electric Field & Electric Potential Energy Worksheet 1) 2) 3) 4) 5) 6) 7) A small positive charge is moved closer to a positively charged object. The E of the small positive charge... a) increases b) decreases c) stays the same. A small negative charge is moved further away from a negatively charged object. The work done on the small negative charge is ... a) positive b) negative c) zero. A small positive charge is moved from 3 cm away from a positively charged object to a location that is 3 cm away on the other side of the object. The work done on the small positive charge is b) positive b) negative c) zero. A proton is moved 5 cm closer to the negative plate in an oppositely charged parallel plate arrangement. ignoring any changes in gravitational energy and if the strength of the eld inside the plates is 600 MC, nd. .. a) the work done in moving the proton. b) the sign of the work done in moving the proton. c) the PE gainedflost by the proton. (1) Was it gained or lost? An electron is sitting 10 cm away from a small object of charge -Sp.C. Find... a) the force that the electron experiences. Is it attractive or repulsive? b) the strength of the electric eld at this point. e) the potential energy stored in the eld at this point. An electron is sitting 10 cm away from a small object of charge -5nC (InC = lE-9C). It is let go and it moves away from the charged object. When it reaches a distance of 15 cm away, nd its speed. An oil droplet of mass 5.4E- 17kg is suspended between two horizontal, oppositely charged parallel plates. The positive plate is at the top and the negative plate is at the bottom. If the electric eld between the plates is 4000 NIC, nd the charge on the oil droplet. Think back to problem #7. The mass is suspended when the electric eld strength is 4000 NRC. Assume that the electric eld is instantly increased to 5000 NC. Find the speed that the oil droplet will hit the top plate, which is 20 cm above it. You will have to use a free-body diagram of the droplet, as well as think about work and energy and their relationship