Electromagnetic induction question

AI Thread Summary
The discussion revolves around a homework question involving electromagnetic induction, specifically calculating the charge flowing through a wire loop subjected to a changing magnetic field. The magnetic field strength is 2.3 T, and the loop is crushed over 0.48 seconds, affecting the magnetic flux. Participants highlight the importance of understanding Faraday's law, which relates the change in magnetic flux to induced electromotive force (emf). There is confusion regarding the appropriate equations to use, with mentions of Lenz's Law and the need to calculate the change in flux. The conversation emphasizes the connection between the change in area, magnetic flux, and the resulting emf in the context of the problem.
fishmonger
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Please help! :confused:
I'm stuck on this homework question and it's due tomorrow.
Any help would be greatly appreciated...

Question:
A magnetic field of strength 2.3 T is directed into the plane of a square loop of wire with each side of length 0.4 m. The loop of wire is then crushed together in .48 seconds so that the loop no longer encloses any area. Find the total amount of charge flowing through the loop if the wire has a resistance of 0.2 .

Thank you in advance
 
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Hi there fishmonger and welcome to PF,

What are your thoughts thus far on this conundrum?
 
Here are my thoughts thus far:

The change in the area within the loop (because of the crushing) should affect the magnetic flux, and the change in flux is what creates the emf...is as far a connection as I've been able to make.
I can't seem to figure out what equation to proceed with in order to actually calculate anything. Lenz's Law, or something completely different...?
 
And thanks for the welcome! :) I wish I'd discovered this forum earlier in the year.
 
fishmonger said:
The change in the area within the loop (because of the crushing) should affect the magnetic flux, and the change in flux is what creates the emf...is as far a connection as I've been able to make.
I can't seem to figure out what equation to proceed with in order to actually calculate anything. Lenz's Law, or something completely different...?
You are quite correct. What you have just (almost) described is Faraday's law. Do you know what Faraday's law is?
 

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