1. The problem statement, all variables and given/known data In a group assignment we had to find out how many electrons were transferred to pieces of tape after we pealed them of a table. The second part of the project asked us to imagine that one piece of tape was a distributed charge and that the other was still a point charge. 2. Relevant equations F=kqq/r^2 F=mg E= kq/(x(x^2+(L/2)^2)^(1/2)) 3. The attempt at a solution We imagined that these two tapes were represented by point charges located at the center of each tape for the first project. our teacher said this method had a problem but I still can't see anything wrong, I would appreciate some help identifying the problem. For the second part of the project I thought that we could use the electric field expression for distributed charge of a rod we derived in class to represent one of the tapes. The only problem is that the tape also has a noticeable width. For this project the only things we could use were expressions we had already derived for electric field of a : a. Dipole b. Set of a finite number of point charges c. A uniformly charged rod d. A uniformly charged ring e. A uniformly charged disk f. A solid sphere uniformly charged throughout its volume g. A spherical shell with a uniformly charged surface Would any of these be more suitable than the rod expression. Thanks in advance for the help.