Flow of current through zero potential difference

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Discussion Overview

The discussion revolves around the flow of electric current in a circuit involving three points A, B, and C, particularly focusing on the conditions under which current flows when potential differences are present or absent. The scope includes theoretical considerations and experimental observations related to electrical circuits and potential differences.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a scenario where points A and C have a finite potential difference and are connected by a wire with non-zero resistance, leading to current flow.
  • Another participant suggests that when point B, with potential equal to A, is introduced, current will flow between B and C due to the finite potential difference, eventually equalizing the potentials at A, B, and C.
  • A different participant questions the observation that a constant current flows through the circuit from the initial moment, seeking an explanation for this phenomenon.
  • One participant reiterates the initial scenario and emphasizes that if the potentials at A, B, and C are not kept constant, current will flow from B to C and from A to B until equal potential is reached.
  • Another participant notes that if A and C are connected to a cell and A and B are at the same potential, current should flow from B to C due to the potential difference, but acknowledges that resistance will prevent A and B from having exactly the same potential.

Areas of Agreement / Disagreement

Participants express differing views on the behavior of current flow under varying conditions of potential difference. There is no consensus on the explanation for the constant current observed in experiments, indicating unresolved aspects of the discussion.

Contextual Notes

Participants highlight the importance of potential differences and resistance in determining current flow, but there are unresolved assumptions regarding the constancy of potentials and the implications of resistance in the circuit.

soumyajitnag
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there are two points A and C having a finite potential difference.they are connected by a wire of non zero resistance.a current will flow through the wire.the wire is now removed and a third point B is introduced which has an potential equal to A.a wire is taken which connects A,B,C.will a current flow through the wire?detailed explanation please!
 
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As there is a finite potential difference between B and C current will flow between them thus changing the potential at B. So current will also flow between A and B till the three points are at equal potential.
 
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but experiments show that a constant current flows through the entire circuit from the very initial moment.any explanation on that part...?
 
soumyajitnag said:
there are two points A and C having a finite potential difference.they are connected by a wire of non zero resistance.a current will flow through the wire.the wire is now removed and a third point B is introduced which has an potential equal to A.a wire is taken which connects A,B,C.will a current flow through the wire?detailed explanation please!

From your question it seems potential at A,B and C are not kept constant .So in that case ,as swap1996 said , current will flow from B to C reducing the potential at B,and so also from A to B until they are at same potential.

but experiments show that a constant current flows through the entire circuit from the very initial moment.any explanation on that part...?
But if the potential at A,B and C are kept constant (say the case when A and C are connected to the terminals of a cell, and A and B are at same potential and there is a resistance between B and C ) then due to the potential difference between B and C ,current will flow from B and C and so same current should flow from A to B.
(However in the physical situation of above example the points A and B connected by a wire ,say, won't have same potential due to small resistance an so there will be a finite potential drop.)
 

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