How does the transfer of electric forces between two objects work

Click For Summary

Discussion Overview

The discussion revolves around the mechanisms of electric charge transfer between two objects, specifically focusing on the processes involved when rubbing materials together, and the factors that determine which object transfers charge to the other. It touches on concepts from electrostatics and chemistry, exploring both theoretical and practical aspects of charge interactions.

Discussion Character

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

Main Points Raised

  • Some participants question what determines which object transfers charge during contact, particularly why the plastic rod does not give its negative charge instead of receiving one.
  • There is curiosity about whether rubbing additional neutral wool against a negatively charged plastic rod would result in further charge transfers, and if there is a limit to how much charge an object can accumulate.
  • One participant explains that the transfer of electrons can be understood through concepts of chemical bonding, where certain materials act as electron donors or acceptors based on their electrical potential energy.
  • It is noted that the effectiveness of charge transfer depends on the materials being insulators and that there is a limit to how much charge can build up due to repulsion between like charges.
  • Another participant introduces the concept of electrostatic induction as an alternative method of charging that does not involve rubbing and is more effective for metals.
  • There is a suggestion that only one entity is responsible for the movement of charge during these interactions, inviting further speculation on which entity that might be.

Areas of Agreement / Disagreement

Participants express curiosity and propose various ideas, but there is no consensus on the specific mechanisms or limits of charge transfer, indicating that multiple competing views remain in the discussion.

Contextual Notes

Participants mention limitations related to the conditions under which charge transfer occurs, such as the nature of the materials involved and the effects of charge buildup, but these aspects remain unresolved.

asilvester635
Messages
12
Reaction score
0
IMG_2512.jpeg


Questions

1.) Here, the negative charge from the wool is transferred to the plastic rod. I'm curious as to what determines which object is responsible of transferring their charge to the other object. Like why didn't the plastic rod give its negative charge instead?

2.) If we rub 19 more neutral wools to this already negatively charged plastic rod, would that result in more transfers of negative charges from the other 19 neutral wools? Or is there a limit as to how many negative charges an object obtains?
 

Attachments

  • IMG_2512.jpeg
    IMG_2512.jpeg
    22.7 KB · Views: 1,421
Physics news on Phys.org
Think of what actually gets transferred when any thing gets charged as a consequence of rubbing together. Also thing what any charged body does to the atmosphere around or to the objects touching and around.
 
asilvester635 said:
I'm curious as to what determines which object is responsible of transferring their charge to the other object.
This 'electrostatic situation' can be regarded as a bit of fringe Chemistry. Molecules are formed when electrons from one atom (or smaller molecule) are attracted to the positive charges on another atom or molecule. We learn about chemical 'Bonding" in school where this happens and results in atoms sticking together. It only works for certain combinations of elements. The details follow strict rules to do with the electrical potential energy around atoms. Some substances are electron donors when they easily give up an electron which a nearby electron acceptor can pick up. The two resulting Ions are attracted to each other and can form a compound. (That's just one form of bonding.)
When you rub two insulators together, you can mechanically dislodge some of the electrons (a very tiny proportion) from an electron donor molecule and they can be left behind on an electron acceptor molecule, giving a positively and a negatively charged surface. If the substances are good insulators, the charges on each surface will stay there and the rod / fur / etc. stays charged. This only works for situations where each of the pair can give or take an electron and when both substances are good insulators.

There is a limit to the number of times you can do this because the charges that build up on a surface will eventually repel any extra charges from being transferred.
Also, there are other ways of charging up an object (electrostatic induction) where no rubbing is involved and it works for metal objects. It's far more effective for building up high charges.
 
sophiecentaur said:
Also, there are other ways of charging up an object (electrostatic induction) where no rubbing is involved and it works for metal objects. It's far more effective for building up high charges
No matter which kind of charging only one entity makes the movement or has a tendency to move. I wanted OP to guess that entity.
 
  • Like
Likes   Reactions: sophiecentaur

Similar threads

  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 16 ·
Replies
16
Views
2K
  • · Replies 20 ·
Replies
20
Views
3K
  • · Replies 20 ·
Replies
20
Views
2K
  • · Replies 10 ·
Replies
10
Views
5K
  • · Replies 3 ·
Replies
3
Views
974
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 24 ·
Replies
24
Views
2K
  • · Replies 36 ·
2
Replies
36
Views
7K