Phys 222 Worksheet 18 With Answers - Ampere'S Law Supplemental Instruction - Dr. Paula Herrera-Siklody, Iowa State University, 2012
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PHYS 222
Worksheet 18 – Ampere’s Law
Course: PHYS 222
Supplemental Instruction
Instructor: Dr. Paula Herrera-Siklódy
Iowa State University
Date: 3/1/12
Useful Equations
B dl
I
Ampere’s Law. Line integral – enclosed path. Use
0 enclosed
symmetry to ensure B is constant
B
nI
Magnetic field inside a solenoid (n is turns/length)
0
Tables
This is a great table to become familiar with: (p. 983)
Related Problems
1)
The figure shows, in cross section, several conductors
that carry currents through the plane of the figure. The
currents have the magnitudes
I
= 4.1 A, I
= 6.1 A,
1
2
and I
= 2.1 A, and the directions shown. Four paths,
3
labeled a through d, are shown.
What are is line integral
B dl
for each of the four paths? (Book 28.36)
Path a: No current is inside that path, thus line integral
equals 0 Tm
Path b:
6
B dl
I
5.2(10 )
Tm
0
enc
Path c:
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