Inductive Current Help | Andrew's Physics 2114 E&M Exam

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SUMMARY

The discussion centers on the concept of inductive currents in the context of a physics exam problem related to electromagnetic fields. Andrew is reviewing a problem involving a long straight wire with a changing current, which induces a magnetic field described by the equation B=(μ)(I)/(2π)(y). He questions whether to consider the self-induction of the circuit, as he believes the induced magnetic field from the circuit will cancel out due to opposing current directions. The consensus is that self-induction should not be ignored, as it plays a crucial role in the overall magnetic field dynamics.

PREREQUISITES
  • Understanding of electromagnetic theory, specifically Ampère's Law
  • Familiarity with the concept of magnetic fields and induction
  • Knowledge of the Biot-Savart Law
  • Basic proficiency in calculus for solving physics problems
NEXT STEPS
  • Review the principles of self-induction and mutual induction in circuits
  • Study the application of Ampère's Law in complex circuit configurations
  • Learn about the Biot-Savart Law and its implications for magnetic field calculations
  • Examine sample problems involving changing currents and induced magnetic fields
USEFUL FOR

Students preparing for physics exams, particularly those studying electromagnetism, as well as educators seeking to clarify concepts of inductive currents and magnetic fields.

BurnieMac
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Hi, I finally registered after finding help from this very useful forum for a while.

I am reviewing for my 2114 E&M Final right now and I'm looking at a sample final from last semester our professor posted:

http://www.physicscourses.okstate.edu/summy/phys2114/Documents/PHYS1214_%20Exam3_2009.pdf

Problem 2 is giving me some trouble. I have an answer that is possibly right I am just having trouble confirming my understandings of it conceptually.

So.
The long straight wire's changing current is going to induce a magnetic field on the circuit.
and I used the equation

B=(u)(I)/(2pi)(y)
Then I realized the circuit is going to induce its own magnetic field... But that magnetic field will just cancel out because the current flowing through it end up canceling out because they go in opposite directions.

Do I just ignore the circuits self-induction??

Much thanks,
Andrew
 
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