Moving a bar magnet through a coil

  • Thread starter Thread starter Jimmy25
  • Start date Start date
  • Tags Tags
    Coil Magnet
AI Thread Summary
When a bar magnet is moved through a coil at a constant speed, the magnetic flux through the loop changes over time, initially increasing as the magnet enters, remaining constant while fully inside, and then decreasing as it exits. The graph of induced current will reflect the negative change in flux, showing a peak during the entry and exit phases of the magnet, with a plateau when the magnet is fully inside the coil. The induced current is generated by the rate of change of flux, leading to a negative slope during the transitions. This results in a distinct shape for both graphs, with the flux showing a normal curve and the current exhibiting a corresponding pattern. Understanding these relationships is crucial for analyzing electromagnetic induction.
Jimmy25
Messages
69
Reaction score
0

Homework Statement



You move a bar magnet through a coil at a constant speed. Graph the flux through the loop as a function of time. Graph the induced current in the loop as a function of time.

Homework Equations





The Attempt at a Solution



Graph of flux vs time:

I'm thinking is should look like a normal curve but once part of the magnet enters the loop will it be constant until the other end of the magnet exits the coil?

Graph of induced current vs time:

Same as flux vs time?
 
Physics news on Phys.org
Flux out the North end of the magnet is the same as flux into the South end.
.. so, there should be a fairly long "plateau" on the top of the "normal" curve.

but the Current is induced by the NEGative CHANGE of flux ( neg. slope)
 
So there will be a flat plateau where "bar" of the magnet is inside the loop?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

EMF induced by a magnet falling through a coil
Replies
4
Views
3K
Induced Current Direction in a Changing Magnetic Field
Replies
1
Views
2K
What is the induced magnetic force on this closed current loop?
Replies
12
Views
2K
Making sense of sequence of ideas in MIT OCW's 8.02 notes on Faraday
Replies
1
Views
1K
B EMF induced by Bar Magnet falling through a Coil
Replies
3
Views
601
Magnet moved in a circular coil
Replies
10
Views
2K
Motional EMF in the presence of a time-varying magnetic field
Replies
11
Views
3K
Flux and Induced EMF vs displacement graphs
Replies
7
Views
5K
How does an eddy current brake work exactly?
Replies
2
Views
2K
How Does Magnet Position Affect EMF in a Coiled Wire System?
Replies
35
Views
4K

Hot Threads

Recent Insights

Back
Top