Analyzing Conditions for Current Flow Through Resistor R

AI Thread Summary
Current will flow through resistor R from right to left when the current I in the nearby wire is decreasing, as per Lenz's Law, which states that induced current opposes the change causing it. The magnetic field generated by the current points into the loop, and a decrease in current results in a change in magnetic flux that is directed out of the page. This opposition to the decrease in current leads to the induced current flowing in the specified direction. The discussion also considers other scenarios, but the consensus is that a decreasing current is the primary condition for the flow through the resistor. Understanding these principles is crucial for analyzing electromagnetic interactions in circuits.
mike1234
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Homework Statement




wireandlooplenzslaw.jpg
The drawing shows a wire loop near a current -carrying wire. Under what conditions would current flow through resistor R from Right to left?

Homework Equations



Lenz's law

The Attempt at a Solution



4 answers
a) when the current I is increasing
b)when the current I is constant
c)when the current I is decreasing
d)all of the above

I think its C but not sure
 
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Why aren't you sure? What's your reasoning?
 
well I know according to Lenz's Law an induced current always flows in a direction that opposes the change that caused it. but with answer C it just decreasing but not heading in the opposite direction so I was not sure
 
The magnetic field from the current points into the loop (into the page). Since it's decreasing, the change in flux is out of the page. (You've got it.)
 
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