How Does Decreasing Wire Current Affect a Nearby Metal Rectangle?

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SUMMARY

The discussion centers on the effects of decreasing current in a long straight wire on a nearby metal rectangle, specifically regarding magnetic induction as described by Lenz's Law. As the current in the wire decreases, the magnetic field also diminishes, leading to an induced current in the rectangle that opposes the change. This results in the rectangle experiencing an attractive force towards the wire due to the interaction of the magnetic fields. The participants clarify that the current in the rectangle flows in opposite directions along its sides, which is crucial for understanding the magnetic interactions at play.

PREREQUISITES
  • Understanding of Lenz's Law
  • Basic principles of electromagnetism
  • Knowledge of magnetic fields and induced currents
  • Familiarity with current-carrying conductors
NEXT STEPS
  • Study the implications of Lenz's Law in various electromagnetic scenarios
  • Explore the concept of magnetic field lines around current-carrying wires
  • Investigate the behavior of induced currents in closed loops
  • Learn about the forces between parallel current-carrying conductors
USEFUL FOR

Students of physics, educators teaching electromagnetism, and anyone interested in the principles of magnetic induction and its applications in electrical engineering.

bbuilder
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Homework Statement



A metal rectangle is close to a long straight current carrying wire, with 2 sides parallel to the wire. If the current in the wire is decreasing, the rectangle is

Homework Equations


Lenz's Law: the direction of any magnetic induction effect is such to oppose the cause of the effect


The Attempt at a Solution


The field of the wire is decreasing; therefore, the current through the wire is traveling in the same direction. If current is moving in the same direction, the wires attract each other. I feel like I am missing something.
 
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bbuilder said:

Homework Statement



A metal rectangle is close to a long straight current carrying wire, with 2 sides parallel to the wire. If the current in the wire is decreasing, the rectangle is

Homework Equations


Lenz's Law: the direction of any magnetic induction effect is such to oppose the cause of the effect


The Attempt at a Solution


The field of the wire is decreasing; therefore, the current through the wire is traveling in the same direction.
I don't understand what you are saying. The wire current is in the same direction as what?

If current is moving in the same direction, the wires attract each other. I feel like I am missing something.
For the rectangle, the current travels around in a loop. So, current in two opposite sides of the rectangle must travel in opposite directions. They cannot both be in the same direction. (I'm not sure if this helps your understanding any.)
 

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