Why is this loop pushed downwards by the magnetic field?

Click For Summary
SUMMARY

The discussion centers on the behavior of a loop in a magnetic field, specifically addressing the forces acting on it due to induced magnetic fields. The key equation referenced is the Lorentz force equation, FB = ∫I ds×B, which describes the force on a current-carrying conductor in a magnetic field. Participants clarify that the induced magnetic field creates a counterclockwise current, resulting in a downward force on the loop when interacting with the external magnetic field. The analogy of bringing two magnets with north poles together is utilized to explain the repulsive forces involved.

PREREQUISITES
  • Understanding of the Lorentz force equation (FB = ∫I ds×B)
  • Basic knowledge of magnetic fields and induced currents
  • Familiarity with magnetic dipoles and their interactions
  • Concept of electromagnetic induction
NEXT STEPS
  • Study the principles of electromagnetic induction in detail
  • Learn about the applications of the Lorentz force in electrical engineering
  • Explore the behavior of magnetic dipoles in various configurations
  • Investigate the effects of induced currents in different materials
USEFUL FOR

Students of physics, electrical engineers, and anyone interested in understanding the dynamics of magnetic fields and induced currents in circuits.

alexdr5398
Messages
31
Reaction score
1

Homework Statement


kOrw33c.jpg


2. Homework Equations
FB = ∫I ds×B

The Attempt at a Solution


My first guess was that it would not move at all.

I understand that there is an induced magnetic field in the opposite direction but wouldn't the induced field produce a current counterclockwise, which, since it's moving in a field, create a force outwards in all directions.?
 
Last edited:
Physics news on Phys.org
You have already drawn a dipole equivalent of the top circuit with the "North" pole down. You also figured out that the induced dipole in the other loop would be in the opposite direction with the "north" pole up. What kind of force do you get when you bring two magnets together with their north poles facing each other?
 
  • Like
Likes   Reactions: alexdr5398
kuruman said:
You have already drawn a dipole equivalent of the top circuit with the "North" pole down. You also figured out that the induced dipole in the other loop would be in the opposite direction with the "north" pole up. What kind of force do you get when you bring two magnets together with their north poles facing each other?

Ah, I see, guess I never made that connection before. Thanks
 

Similar threads

Induced current and force on circular loop in varying magnetic field
  • · Replies 4 ·
Replies
4
Views
1K
Induced Current Direction in a Changing Magnetic Field
  • · Replies 1 ·
Replies
1
Views
2K
How does an eddy current brake work exactly?
  • · Replies 2 ·
Replies
2
Views
3K
What is the induced magnetic force on this closed current loop?
  • · Replies 12 ·
Replies
12
Views
2K
Magnetic field affecting a circular loop
  • · Replies 1 ·
Replies
1
Views
2K
How Does Induced Current Change with Loop Acceleration Through a Magnetic Field?
  • · Replies 8 ·
Replies
8
Views
2K
What is the net force on the current loop?
  • · Replies 8 ·
Replies
8
Views
2K
Understanding Torque in a Magnetic Field with Loop
  • · Replies 37 ·
2
Replies
37
Views
5K
Motional EMF in the presence of a time-varying magnetic field
  • · Replies 11 ·
Replies
11
Views
3K
Direction and magnitude of electric field produced by current change
  • · Replies 8 ·
Replies
8
Views
2K