Can anyone PLEASE tell me how a current balance works?

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SUMMARY

The discussion centers on understanding the operation of a current balance, specifically in the context of measuring magnetic flux density. Participants clarify that the current balance apparatus uses the magnetic force generated by current through coils, which is balanced against a weight force. The formula B = F/(I * L) is essential for calculating magnetic flux density, where F is derived from the weight measured by the balance. Additionally, the left-hand rule is emphasized for predicting the direction of forces in relation to current and magnetic fields.

PREREQUISITES
  • Understanding of electromagnetism principles
  • Familiarity with the left-hand rule for magnetic forces
  • Knowledge of the current balance apparatus and its components
  • Ability to apply formulas such as F = mg and B = F/(I * L)
NEXT STEPS
  • Study the operation and applications of the current balance apparatus
  • Learn about the left-hand rule and its applications in electromagnetism
  • Explore the concept of magnetic flux density and its calculations
  • Investigate the relationship between current, magnetic fields, and forces in electromagnetism
USEFUL FOR

Students studying electromagnetism, physics educators, and anyone interested in the practical applications of current balance measurements in laboratory settings.

  • #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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