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

  1. Mar 14, 2017 #1
    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
    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. jcsd
  3. Mar 14, 2017 #2
    • Poster has been reminded that the student must do the bulk of their work here
    Welcome @jlmccart03 to Physics Forums!

    I would like to help you out with your simple problem.

    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".

    Hope I've answered your question appropriately.
  4. Mar 14, 2017 #3
    Ok, I get what you are saying,but class 1 to 3 should not be attractive. They are not metals that provide magnetic forces. So then, how do I relate these to figuring out which bar in the HW problem belongs to which group. I just don't understand how to figure out the class from simple attraction and repulsion?
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