Investigating Induced Current in Circular Coils

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SUMMARY

The discussion centers on the behavior of induced current in a smaller circular coil when a switch in a larger circular coil is closed. When the switch is closed, the current in the larger coil flows counterclockwise, generating a changing magnetic field. According to Lenz's Law, the induced current in the smaller coil will flow in a direction that opposes this change, resulting in a clockwise direction. The induced current will only flow for a short duration, ceasing once the magnetic field stabilizes.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with Lenz's Law
  • Basic knowledge of magnetic fields and their interactions
  • Concept of magnetic flux linkage
NEXT STEPS
  • Study Faraday's Law of Electromagnetic Induction
  • Explore practical applications of Lenz's Law in electrical engineering
  • Investigate the behavior of magnetic fields in different coil configurations
  • Learn about transient currents and their effects in circuits
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Physics students, electrical engineers, and anyone interested in the principles of electromagnetic induction and circuit behavior.

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If I have a top view of two circular coils of conducting wire lying on a flat surface, what is the direciton of induced current that appears in the smaller coil when the switch in the larger coil is closed?

I'm trying to figure out:
1.) which direction the induced current would flow through the smaller coil
2.) how long it would flow: forever, or only for a short time.

I've attached a picture of the wires for clarification.

I'm not sure how to solve this. I know that induced current in a loop occurs only when the magnetic field through that loop changes. I'm assuming that when the switch is closed a current will run counterclockwise around the larger loop, but I don't know if this is a valid assumption, or what that does for the smaller loop. Can soemone help please?

Thank you.
 

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Can't see the diagram now, but the idea is basically to use Lenz's Law, that the direction of the induced current in the smaller loop will flow in the direction that would create an induced magnetic field which opposes the change in magnetic flux linkage through it i.e. in the likes of N against N and S against S in a simplistic analysis in this case.
 

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