
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 7
Due Monday, November 2, by 2 pm in PHY 142 homework locker
You may have to wait for Tuesday's lecture to do many of these problems
 Problem 1 [5 points]
Consider a square loop of side a, with current I_{1}, sitting a distance d awary from an infinite straight wire with current I_{2} as shown in the picture below. What is the net force on the loop due to the magnetic field of the wire. Consider both the case where I_{1} > 0 (current clockwise as shown) and I_{1} < 0 (current counterclockwise, opposite as shown). Be sure to give the magnitude and direction of the force.
 Problem 2 [10 points]
a) Consider two infinite flat planes separated by a distance d. The planes are oriented with normal in the z direction. If the top plane has a uniform surface current density K in the x direction, and the bottom plane has a uniform surface current  K in the x direction, find the magnetic field everywhere above, below, and in between the two planes. What if the bottom plane has surface current +K in the x direction? What if the bottom plate has surface current K in the y direction?
b) Consider an infinite flat plane of finite thickness d. The plane is oriented with normal in the z direction. A uniform current density J is distributed throughout the crosssectional area of the plane. Find the magnetic field above, below, and inside the plane.
 Problem 3 [10 points]
Purcell 6.16  assume the current is distributed uniformly over the crosssectional area of the rod.
 Problem 4 [10 points]
Purcell 6.3
 Problem 5 [10 points]
Purcell 6.4
 Problem 6 [5 points]
Purcell 6.12

