How Does Decreasing Wire Current Affect a Nearby Metal Rectangle?

AI Thread Summary
When the current in a long straight wire decreases, it affects the magnetic field around it, which in turn influences a nearby metal rectangle. According to Lenz's Law, the induced current in the rectangle will oppose the change in magnetic field, leading to a current that circulates around the rectangle. The rectangle's sides parallel to the wire will experience different magnetic forces, resulting in an attraction between the wire and the rectangle. It is important to recognize that the current in the rectangle flows in opposite directions on its two sides. Understanding these interactions is crucial for analyzing the effects of changing current on nearby conductive materials.
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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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