Solving a Physics Problem Involving a Square & Magnetic Field

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SUMMARY

The discussion centers on a physics problem involving a square loop exiting a magnetic field and the resulting induced electromotive force (EMF). As the square leaves the magnetic field, the magnetic flux decreases, causing the induced current to flow clockwise. The participant seeks clarification on the forces opposing the motion of the square and how to calculate the changing current and power required to move the loop outside the magnetic field. Key equations mentioned include power calculations before and after the square exits the field.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with Faraday's Law of Induction
  • Knowledge of magnetic flux and its relation to current
  • Basic understanding of circuit power calculations
NEXT STEPS
  • Study Faraday's Law of Induction in detail
  • Learn about Lenz's Law and its application in induced currents
  • Research power calculations in electromagnetic systems
  • Explore the relationship between magnetic flux and induced EMF
USEFUL FOR

Students studying electromagnetism, physics educators, and anyone interested in understanding the principles of electromagnetic induction and its applications in circuit analysis.

Frillth
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Homework Statement



I have the following problem for physics homework:

mkakra.png


We are supposed to take t=0 as the instant when the corner of the square is just about to leave the magnetic field.

Homework Equations



Unsure.

The Attempt at a Solution



Since the magnetic flux will decrease as the square leaves the field, the induced magnetic field because of the induced EMF in the square will also point downward. This tells us that the current will flow clockwise.

That's all I've got so far, and I don't even know if it's right. What is producing the forces here that would oppose our push on the square?

Edit: OK, I think that before tv=L/sqrt(2), power is 2IBtv^2. After tv = L/sqrt(2), power is 2IBv(sqrt(2)L - tv). Is it true that the current in the wire will change as the square gets pushed? If so, what do I do to figure out what current is in terms of the other variables?
 
Last edited:
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How much power is needed to move the loop outside the B-field?
 

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