# Homework Help: Identify class for three metal bars (Magnetic Field)

1. Mar 14, 2017

### jlmccart03

1. The problem statement, all variables and given/known data
I need to identify which class bar 1 and bar 2 belong in based on observed attraction/repulsion. Then I need to determine if the end of 2A would attract, repel, or niether to end 3A.

EDIT: Could not get this image in the post due to security reason apparently so here is the link
http://imgur.com/r5QeR3z
2. Relevant equations
No equations needed.

3. The attempt at a solution
I am simply lost on how to even begin to understand how they determine the class. I want to say that Bar 2 is a magnet so it belongs in class 1, but

2. Mar 14, 2017

### Shubham Jaydeokar

• Poster has been reminded that the student must do the bulk of their work here
Welcome @jlmccart03 to Physics Forums!

But before giving you the detailed description about your answer to the problem, I would first like to tell you that the classes made in the table are not related to any metals and their respective Magnetic Properties in Nature. They simply mean a Class as in a Classroom.

Now, Let's Begin...

--The materials in the Class 1 are Magnets, Nails and Compass.
--The materials in Class 2 are Penny, Nails.
--The materials in Class 3 are Wood, Plastic, Foil and Penny.

--The table drawn below these classes represents the inter-magnetic properties of the above-listed materials. This basically means in simple words as "How would the materials from a specific Class (Row) would react to the materials of another class (Column).

--For the First case of Class1(ROW) to Class1(COLUMN), the materials contains Magnets, hence they are "ATTRACTIVE" to each other.
--For the Second case of Class1(ROW) to Class2(COLUMN), it is clear that as a magnet in class 1 is attracted to all the materials of class2, it is also named as "ATTRACTIVE".
--For the Third case of Class1 to Class3, it should be "Attractive".
--Similarly, for Class2 to Class2, "Not Attractive".
CLass2 to Class3, "Not Attractive".
and for the last one, Class 3 to class 3 itself, it should be "Not Attractive".