Metal frame moved through uniform magnetic field

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SUMMARY

The discussion centers on the behavior of a square metal frame PQRS, measuring 12 cm per side, as it moves through a uniform magnetic field with a flux density of 2.0 × 10-2 T. When entering the magnetic field, the current flows anti-clockwise, while no current is induced in the middle of the field due to the absence of flux cutting. Upon exiting the field, the current direction shifts to clockwise. The determination of current direction is explained using Lenz's Law rather than Fleming's Left Hand Rule.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with Lenz's Law
  • Knowledge of magnetic flux and its effects on conductors
  • Basic concepts of electric current direction in magnetic fields
NEXT STEPS
  • Study the applications of Lenz's Law in electromagnetic systems
  • Explore the principles of electromagnetic induction in various configurations
  • Learn about the relationship between magnetic flux and induced current
  • Investigate the use of Fleming's Left Hand Rule in different contexts
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Students of physics, educators teaching electromagnetic theory, and engineers working with electromagnetic systems will benefit from this discussion.

Masafi
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A square rigid metal frame PQRS, of side 12 cm, forms a closed circuit with an ammeter. It is moved through an enclosed region of uniform magnetic field of flux density 2.0 × 10–2 T, from left to right. The field is confined to this area and directed into the page.

PQRS --> magnetic field -->

Give the direction of the current through the ammeter when enterting, in the middle, and leaving:

1. entering: anti clockwise
2. middle: no current (not cutting any lines of flux)
3. leaving: clockwise

How do we determine the direction of the current? I cannot do this using Flemings Left Hand rule?
 
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