
Home
Contact Info
Course Info
Calendar
Homework
Recitation
Exams




PHY 142: Electricity & Magnetism (Honors)
Prof. S. Teitel stte@pas.rochester.edu  Fall 2009
Problem Set 5
Due Friday, October 16, by 2 pm in PHY 142 homework locker
 Problem 1 [5 points]
Purcell 3.1
 Problem 2 [10 points]
Purcell 3.4
 Problem 3 [10 points]
Purcell 3.8  The outer planes connected by a wire means that they must be at the same electrostatic potential.
 Problem 4 [5 points]
Purcell 3.9  Ignore the last two sentences of the problem. The geometry for the problem is as shown below. For the first part there are four charges, all equidistant from the x and y axes. For the second part there is one charge in front of a bent conducting plane as shown.
 Problem 5 [10 points]
Purcell 3.17  This problem refers to a conducting sphere of radius b, surrounded by a conducting spherical shell of inner radius a.
Hint: The electric field between the conducting spheres is proportional to the charge Q on the inner sphere. The smaller is the radius of the inner sphere b, the smaller is the Q that can be put on the inner sphere and still satisfy the constraint E(b)=E_{0}. For each b, there is thus a maximum Q that can be stored on the inner sphere. The energy stored in the capcitor is proportional to Q^{2}. Your job is to find the b that allows the maximum energy to be stored.
 Problem 6 [10 points]
Purcell 3.23 part (a) only

