About the experiment to find the reactance of inductor

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SUMMARY

The discussion centers on an experiment conducted to determine the reactance of an air-core inductor and a soft-iron core inductor. The results showed that the graph of Vrms against Irms for the air-core inductor passed through the origin, while the graph for the soft-iron core inductor exhibited a negative y-intercept. This discrepancy raises questions regarding the linearity of the permeability and potential measurement errors, particularly concerning the maximum current and the number of turns in the coil. Participants are encouraged to analyze the χ2 values of their fits to understand the deviations further.

PREREQUISITES
  • Understanding of reactance in inductors
  • Familiarity with graphing Vrms against Irms
  • Knowledge of permeability in magnetic materials
  • Basic statistical analysis, including χ2 fitting
NEXT STEPS
  • Research the principles of reactance in air-core and soft-iron core inductors
  • Learn about the significance of linearity in permeability and its effects on inductance
  • Study the process of performing χ2 analysis for experimental data
  • Explore methods for minimizing measurement errors in electrical experiments
USEFUL FOR

Physics students, electrical engineers, and anyone conducting experiments related to inductors and reactance analysis.

lindacheung66
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I have just done an experiment on finding the reactance of (a)an air-core inductor and (b)an inductor with a soft-iron core.
I have plotted a graph of Vrms against Irms for each experiment.
For the graph in (a), the straight line can pass through origin; yet, for the graph in (b), the straight line cannot pass through the origin, but have a negative y-intercept.
However, I cannot find an answer to explain this.
Could anyone please kindly tell me why the graph in (b) cannot pass through the origin??
 
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It seems to be quite strange result. Have you analysed errors? What is a χ2 of the fit you made and what would be χ2 for a proportional fit (going through 0,0)?
Or maybe you went out of the linear region of permeability? What was the max current you measured and how many turns your coil has?Post your plots if you want more detailed comments.
 
Since this experiment will be counted in the public exam, I cannot post it on the internet.
Would you mind if you give me your email address so that I can send you my graphs?
 
lindacheung66 said:
Would you mind if you give me your email address so that I can send you my graphs?
Sent to you as a private message.
 

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