Inducing a magnetic field with a wire due to flux

Click For Summary
SUMMARY

The discussion centers on the behavior of induced current in a stationary loop of wire placed in a magnetic field. The correct answer to the homework question is that the current in the loop is clockwise when the magnetic field is decreasing. This conclusion is based on Lenz's Law, which states that the induced current creates a magnetic field opposing the change in the inducing magnetic field. In this case, as the magnetic field directed into the page decreases, the induced current generates a magnetic field that also points into the page, resulting in a clockwise current.

PREREQUISITES
  • Understanding of Lenz's Law
  • Familiarity with magnetic fields and their direction
  • Knowledge of induced current in electrical circuits
  • Basic principles of electromagnetism
NEXT STEPS
  • Study Lenz's Law in detail to understand its applications
  • Explore Faraday's Law of Electromagnetic Induction
  • Investigate the relationship between magnetic flux and induced electromotive force (EMF)
  • Practice problems involving induced currents in various configurations
USEFUL FOR

Students studying electromagnetism, physics educators, and anyone seeking to deepen their understanding of induced currents and magnetic fields.

wosman
Messages
3
Reaction score
0

Homework Statement


A stationary loop of wire is placed in a magnetic field directed into the page. The current in the loop of wire:

and then it lists 4 multiple choice options. the answer is: the current in the loop of wire is clockwise if the magnetic field is decreasing.


Homework Equations


non really


The Attempt at a Solution



My issue is when trying to solve this i realized that if the current is clockwise then a magnetic field will be created that is going into the page. BUT lenz's law states the induced current will create a magnetic field OPPOSING the inducing magnetic field.

So I would have answered the question by saying the current would be counterclockwise since this would make a magnetic field that comes out of the page (i.e. opposing the inducing magnetic field)

I'm not sure why the answer is the one that is written. Any help is appreciated.
 
Physics news on Phys.org
Welcome to PF.
wosman said:
... lenz's law states the induced current will create a magnetic field OPPOSING the inducing magnetic field...
Not quite. The induced current creates a field opposing the change in the inducing magnetic field.

The inducing field is into the page, but decreasing. Therefore the change in this field is in what direction?
 
Redbelly98 said:
Welcome to PF.

Not quite. The induced current creates a field opposing the change in the inducing magnetic field.

The inducing field is into the page, but decreasing. Therefore the change in this field is in what direction?

The change is "out of the page" thus the created field opposes this by going into the page!

Thanks so much!
 

Similar threads

Replies
4
Views
1K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
8
Views
2K
  • · Replies 7 ·
Replies
7
Views
1K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
8
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
11
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K