What is the Equivalent Resistance in this Circuit?

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Homework Help Overview

The discussion revolves around determining the equivalent resistance in a specific electrical circuit, as depicted in an image linked by the original poster. The subject area is circuits, particularly focusing on concepts related to equivalent resistance and circuit analysis.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster expresses confusion regarding the question despite understanding the concept of equivalent resistance. Some participants suggest considering the implications of a zero reading on the ammeter, proposing that the branch can be treated as a short or open circuit. Others inquire about the Wheatstone Bridge and its balancing condition, prompting further exploration of circuit behavior.

Discussion Status

The discussion is ongoing, with participants offering various perspectives on how to approach the problem. There is an exchange of ideas regarding the implications of the ammeter's reading and the relevance of the Wheatstone Bridge, indicating a productive exploration of the topic without reaching a consensus.

Contextual Notes

The original poster has requested to ignore certain marks on their page, which may imply additional context or constraints that are not fully disclosed. The discussion also hints at the need for clarity on circuit configurations and assumptions about the components involved.

keemosabi
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Homework Statement


http://img265.imageshack.us/img265/9245/45050879.png"


Homework Equations





The Attempt at a Solution


I really just don't know. I understand how equivalent resistance works, but I just don't get this question. Please ignore the marks I have on the page.
 
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Since the ammeter reads zero, that branch can be taken as short circuit or open circuit.
Now apply equivalent resistance formula to find R.
 
rl.bhat said:
Since the ammeter reads zero, that branch can be taken as short circuit or open circuit.
Now apply equivalent resistance formula to find R.
Sorry, but I'm not really sure what you mean by that.
 
keemosabi said:
Sorry, but I'm not really sure what you mean by that.

Have you heard about the Wheatstone Bridge? What is the balancing condition of the bridge?
When there is no current in the ammeter, either remove the ammeter from that branch, or replace it by a conductor and find the equivalent resistance of the circuit.
 

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