Can anyone PLEASE tell me how a current balance works?

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Homework Help Overview

The discussion revolves around understanding the operation of a current balance, particularly in the context of electromagnetism. The original poster seeks clarification on how to measure magnetic flux density using this apparatus, as they are encountering difficulties with related homework questions.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the basic principles of a current balance, including the relationship between current, magnetic force, and weight. There are inquiries about measuring wire length and the implications of different setups. Some participants express confusion about predicting the behavior of the apparatus in various scenarios.

Discussion Status

Participants are actively engaging with the problem, sharing insights and clarifications. Some have offered guidance on using the left-hand rule and the right-hand grip rule to understand the magnetic field directions. There is a mix of interpretations regarding the outcomes of specific configurations, and the discussion remains open with no clear consensus yet.

Contextual Notes

There are mentions of specific figures and diagrams from a textbook that are central to the discussion, with some participants indicating they need to share these visuals for better understanding. Additionally, the original poster has been allowed to use an ammeter, which influences their approach to the problem.

  • #31
That's just the length of the wire inside the magnet right?

The answer's 0.0078 T.
 
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  • #32
looks right doesn't it?
 
  • #33
If B = 0.0078 T, then L has to equal 0.503 m, and I really don't know how that's supposed to come about. Unless of course the decimal in 5.0 is a misprint.
 
  • #34
came out write when I did it, just check over your arithmetics
 
  • #35
Using 1.962x10-3 N for force, 0.50 A for current, and 5x10-2 m for length, I get 7.85x10-2 T, which isn't the right answer. :( How'd you get it right?
 
  • #36
the mass is 0.02g
 
  • #37
Haha, I took the 0.02 g correctly, I just didn't convert it correctly. Used x10-2, must've pressed the wrong button. Got the correct answer!

But does this mean that I'm supposed to use the length of the wire that only passes through the magnet? [because only that can obviously be 5 cm]
 
  • #38
yes, this force is produce only when the current is under the influence of a magnetic field, so outside the magnetic field there isn't this type of force (sorry for not clarifying this earlier)
 
  • #39
Right, right, and right. Thank you SO much for your help. Life saver!
Good day. :)
 
  • #40
no worries :)
 

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