Question about electromagnetic induction

Click For Summary
SUMMARY

The discussion centers on the behavior of magnetic flux and induced electromotive force (EMF) when a bar magnet moves through a circular coil. As the magnet approaches, the magnetic flux increases, peaking when the magnet is at the center of the coil, and then decreases as the magnet recedes. The corresponding EMF graph shows a peak at the same time as the magnetic flux, increasing as the magnet approaches and decreasing as it moves away, but it does not start from negative infinity. This behavior is a direct consequence of Faraday's law of electromagnetic induction.

PREREQUISITES
  • Understanding of Faraday's Law of Electromagnetic Induction
  • Knowledge of magnetic flux concepts
  • Familiarity with the relationship between magnetic fields and induced EMF
  • Basic graphing skills for visualizing functions
NEXT STEPS
  • Study the mathematical formulation of Faraday's Law
  • Learn about Lenz's Law and its implications on EMF direction
  • Explore applications of electromagnetic induction in real-world devices
  • Investigate the effects of coil turns and magnet speed on induced EMF
USEFUL FOR

Students of physics, educators teaching electromagnetic theory, and engineers working with inductive components will benefit from this discussion.

stunner5000pt
Messages
1,447
Reaction score
5
Lets say there's a bar magnet going at a speed V (North pole first) through the central axis of symmetry of the circular coil.

Sketch the graph of the graph of the magnetic flux through the circular loop as a function of time. Also sketch the graph of the corresponding emf as a function of time.

I hope you understand the question just tell me if yu don't ill put up a diagram.

When the magnet approaches the flux increases, peaks when the magnet is at the centre of the coil, and then reduces as the magnet recedes.
SO the graph would look like a smooth edged A with asymptotic sides on the X axis

Forthe plot of EMF vs Time, the EMF would constantly increase (??) as the magnet approaches, then reach a max when the magnet is at zero, and then start from negative infinity as the magnet receded??

Your help would be appreciated!
 
Physics news on Phys.org
The graph of the magnetic flux through the circular loop as a function of time would look like a smooth, symmetrical bell curve. The flux would start from zero, increase as the magnet approaches, peak when the magnet is at the center of the coil, and then decrease as the magnet recedes. The graph of the corresponding emf as a function of time would look like a straight line that increases as the magnet approaches and then decreases as the magnet recedes. The emf would reach its maximum value at the same time as the magnetic flux reaches its peak.
 


Yes, I understand the question and it is a good one. The graph of magnetic flux through the circular loop as a function of time would indeed look like a smooth edged A, with the peak occurring when the magnet is at the center of the coil. This is because the magnetic flux is directly proportional to the magnetic field, and as the magnet moves closer to the coil, the magnetic field increases, reaching its maximum at the center, and then decreases as the magnet moves away.

As for the graph of EMF as a function of time, it would also have a peak at the center of the coil, but it would not start from negative infinity as the magnet recedes. This is because the EMF is induced by the change in magnetic flux, and as the magnet moves away, the change in magnetic flux decreases, resulting in a decrease in EMF. So the graph would have a peak at the center, and then decrease as the magnet moves away, but it would not go to negative infinity.

I hope this helps clarify your understanding of electromagnetic induction. It is a fascinating phenomenon that has numerous applications in our daily lives. If you have any further questions, please let me know.
 

Similar threads

Replies
5
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K