Induction of Charge: Why & How Does it Occur?

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Discussion Overview

The discussion revolves around the phenomenon of charge induction when a point charge is placed near a conducting infinite plane. Participants explore the mechanisms of charge redistribution in conductors, the implications for net charge, and the definitions of induced charge versus net charge.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how a net charge of -q can be induced on the plane while the conductor remains overall neutral, suggesting that the movement of free electrons does not change the net charge of the plane.
  • Another participant clarifies that while there is a net charge on the surface of the conductor due to the redistribution of conduction electrons, the conductor itself remains net neutral, ensuring no electric field exists within it.
  • There is a repeated inquiry about the term "induced charge" as used in a textbook, with a participant seeking clarification on how this induced charge is measured and whether it differs from the net charge of the plane.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the definitions of induced charge and net charge, with no consensus reached on how these concepts relate to each other in the context of charge induction.

Contextual Notes

The discussion highlights potential ambiguities in terminology and the need for clearer definitions regarding induced charge and net charge, as well as the assumptions underlying the behavior of charges in conductors.

greatscott
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When a point charge of +q is put near a conducting infinite plane, net charge of -q is induced on the plane. Why and how does this occur? I thought that although the charges (free electrons) in the conductor will move (so that the electrons are closer to the point charge), the net charge of the plane will still be zero.
 
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There will be net charge on the surface of the conductor but the conductor will remain net neutral. The conduction electrons throughout the conductor redistribute themselves such that there is no electric field within the conductor and field at the surface is normal to the surface.
 
The book says "the total charge induced on the plane is -q." Maybe "induced charge on the plane" means something different from the net charge of the plane? How is "induced charge" measured?
 
greatscott said:
The book says "the total charge induced on the plane is -q." Maybe "induced charge on the plane" means something different from the net charge of the plane? How is "induced charge" measured?

Tide answered that already:

Tide said:
There will be net charge on the surface of the conductor...

Tide said:
but the conductor will remain net neutral.
 

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