Electric fields, Superposition, and Intervening Matter

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SUMMARY

The discussion centers on the interaction of electric fields with intervening matter, specifically through the lens of the superposition principle. It highlights Experiment 15.EXP.22, which demonstrates that the repulsion between like-charged tape is diminished when paper is placed between them, not by blocking the field but by the superposition of the electric fields, including those induced by the paper's dipoles. The induced dipoles in the paper create a net effect that attracts the tape, illustrating the complexities of electric field interactions.

PREREQUISITES
  • Understanding of electric fields and forces
  • Familiarity with the superposition principle in physics
  • Knowledge of induced dipoles and their behavior in electric fields
  • Basic grasp of experimental physics, particularly related to charge interactions
NEXT STEPS
  • Study the superposition principle in greater detail, focusing on electric fields
  • Explore the concept of induced dipoles in various materials
  • Review Experiment 15.EXP.22 to understand practical applications of these principles
  • Investigate the mathematical representation of electric fields and superposition
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Students of physics, educators explaining electric fields, and anyone interested in the principles of electrostatics and their applications in real-world scenarios.

johns120
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So my physics textbook briefly mentions

The fact that an electric field acts through intervening matter is another example of the superposition principle. It is true that the
repulsion between two like-charged pieces of tape is weaker when a piece of paper is in the way (Experiment 15.EXP.22), but when
viewed in terms of the superposition principle this reduction is not due to the paper partially “blocking” the field of the other tape.
Rather, we say that the net field is due to the superposition of two fields: the same field that you would have had without the paper
intervening, plus another field due to the induced dipoles in the paper.

What I don't understand is: If the paper is put between the charges, those charges would induce a dipole, right? Since there are charges on both sides and "like-charged" which way would the dipole point. The book says the tape is attracted to the paper (which your left to infer creates a force pulling each piece of tape in towards the paper) I just can't visualize how this is possible and I certainly don't understand what the superposition principle has to do with it. https://www.physicsforums.com/attachment.php?attachmentid=39236&d=1316902478"
 
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Just a guess. Maybe the dipoles nearer to the left surface of the paper will have the negative poles to the left, and the dipoles nearer to the right surface of the paper will have the negative poles to the right.
 

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