What is Faraday's Law of Induction?

Click For Summary
SUMMARY

Faraday's Law of Induction describes how a changing magnetic flux through a loop induces an electromotive force (EMF) in a conductor. The discussion emphasizes Lenz's Law, which states that the direction of the induced current opposes the change in magnetic flux that produced it. For instance, if the magnetic flux through a loop increases, the induced current will flow in a direction that creates a magnetic field opposing that increase. This principle is crucial for understanding electromagnetic induction and its applications in electrical engineering.

PREREQUISITES
  • Understanding of electromagnetic concepts, specifically magnetic flux
  • Familiarity with Lenz's Law and its implications
  • Basic knowledge of circuits and current direction
  • Ability to interpret physical laws in the context of electromagnetism
NEXT STEPS
  • Study the mathematical formulation of Faraday's Law of Induction
  • Explore practical applications of Lenz's Law in electrical engineering
  • Watch educational videos on electromagnetic induction for visual understanding
  • Practice problems involving induced EMF and magnetic flux changes
USEFUL FOR

Students of physics, electrical engineers, and educators looking to deepen their understanding of electromagnetic induction and its foundational principles.

dinhjeffrey
Messages
30
Reaction score
0

Homework Statement



attachment.php?attachmentid=34851&stc=1&d=1303698759.jpg

#32

Homework Equations



faraday's law of induction


The Attempt at a Solution


umm i don't really understand this concept:frown: so here's my attempt. the answer is C so is it because if you have a wire within a wire and the current of one wire is going one direction, the current of the other wire always goes the opposite direction?
 

Attachments

  • 32-36 001.jpg
    32-36 001.jpg
    21.5 KB · Views: 462
Physics news on Phys.org
No that is not a good way to think about it. If the current in the outer wire were decreasing, then they would be going the same way. You have to think in terms of flux. Lenz's law says: "An induced current is always in such a direction as to oppose the motion or change causing it"

The cause of the induced current is the changing magnetic flux through the loop. The flux is increasing into the page, so the wire on the inside needs to produce a flux out of the page to resist the change.

If the wire on the outside had its current decreasing then there would be less flux into the page, so the inside wire would have to produce more flux into the page, and the currents would be in the same direction.
 
thxthx i understand it now ^^
 
dinhjeffrey said:
thxthx i understand it now ^^

Good! Lenz's law is very cool. Check out this video on Lenz's Law.

 
Last edited by a moderator:
oh cool my teacher showed us this in class too! lool
 

Similar threads

  • · Replies 11 ·
Replies
11
Views
3K
Replies
7
Views
1K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K