Magnetic Circuit Homework: Get Help with Unseen Questions

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SUMMARY

The discussion centers on solving a magnetic circuit homework problem involving the formula for magnetic force of attraction, expressed as F = (Bg^2)*Ag/(2*permeability of air). The participant expresses frustration over the lecturer's tendency to include questions not covered in class, indicating that the formula is not taught. Another contributor confirms the correctness of the formula, linking it to the principle of virtual work in magnetic fields. The conversation highlights the challenges students face with unseen questions in academic settings.

PREREQUISITES
  • Understanding of magnetic circuits and forces
  • Familiarity with the principle of virtual work
  • Knowledge of magnetic field concepts and parameters
  • Basic algebra for manipulating equations
NEXT STEPS
  • Research the principle of virtual work in physics
  • Study magnetic circuit analysis techniques
  • Explore the implications of permeability in magnetic materials
  • Learn about advanced magnetic force calculations and applications
USEFUL FOR

Students in electrical engineering, physics majors, and anyone tackling magnetic circuit problems in academic or practical applications.

keongie
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Homework Statement


Refer attachment q.

Homework Equations


Refer attachment f.

The Attempt at a Solution


Refer attachment t.

Please help, this lecturer likes to give questions that are not taught during exams.
 

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Last edited:
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Alright, done research online, found the formula of magnetic force of attraction. F = (Bg^2)*Ag/(2*permeability of air). I guess it is the missing piece of the puzzle and the rest of the question should unravel themselves.

Any other opinion or idea? Please do not hesitate to reply.

100% sure that the formula is not found nor taught in class. It is either a killer question to fit the bell curve or whateva it is. My deepest appreciation and gratitude to those who have viewed and tried helping, thanks a million.
 
I would like to check your answers but am unable to read your scanned sheets 2 and 3.

Maybe you could just write down your answers on a separate sheet in LARGE ALPHANUMERICS, then I'll tell you if I got the same answers.

Your formula for force is correct, derived simply from the principle of virtual work (incremental change in energy in the magnetic fields in the three air gaps = force* incremental distance).
 

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