PHY 2054 Midterm: 2054_Spring14_Exam1-Solutions
Document Summary
Exam 1 solutions: a thick conducting spherical shell has inner radius r and outer radius r, as shown in the diagram. A point charge of q is located at the center of the sphere and a charge of +q is placed on the conducting shell. The charge on the outer surface of the conducting shell is: Solution: the e field in the conductor is zero. If we draw a gaussian surface inside the conductor, gauss" law says that zero flux (because of e = 0) implies that the total enclosed charge is zero. Hence the charge on the inside surface must be +q to cancel the q in the center. The charge on the outside surface is thus q q: two large, parallel, conducting plates are 1. 2 mm apart and have equal and opposite charges on their facing surfaces. An electrostatic force of 3 10 anywhere between the two plates.
