Magnetomotive Force: Causes, Effects & Wire Bending

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SUMMARY

Magnetomotive force (MMF) is defined as the effort exerted to create a magnetic field, calculated using the formula MMF = turns x current. Increasing the number of turns in a coil or the current flowing through it directly enhances the MMF. For example, a wire bent in a circular shape carrying 1 A produces 1 At, while bending the same wire 50 times results in 50 At due to the cumulative effect of each turn contributing to the overall MMF. This principle is crucial for understanding magnetic fields in electrical engineering applications.

PREREQUISITES
  • Understanding of basic electromagnetism concepts
  • Familiarity with electrical current and its measurement in Amperes
  • Knowledge of coil configurations and their impact on magnetic fields
  • Basic mathematical skills for applying the MMF formula
NEXT STEPS
  • Research the relationship between MMF and magnetic flux in different materials
  • Explore the applications of MMF in transformer design and operation
  • Learn about the effects of coil geometry on magnetic field strength
  • Investigate advanced topics such as magnetic circuit analysis
USEFUL FOR

Electrical engineers, physics students, and anyone interested in the principles of magnetism and its applications in electrical systems.

Rasine
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what is magnetomotive force? what causes it? what does it affect? and if 1 At is produced by a wire bent in a circualr shape carrying 1 A, why would the same wire produce 50 At if it was bent 50 times instead of once?
 
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In simple terms, magnetomotive force is the effort exerted in creating a magnetic field. Increasing either the number of turns or the current in the coil will increase the mmf. The same changes will also increase the flux if the medium in which the coil is can carry more flux. To find the magnitude of the mmf a formula

mmf=turns x current

having more turns, say 50 increases the mmf since we add the mmfs "efforts" for all the turns. Each section of the coil (turn) contributes to the overall mmf.
 

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