Relation between current and flux

In summary, the conversation discusses the relationship between voltage, flux, and current. It is stated that voltage is proportional to the negative change in flux, and in a motor, a change in flux induces a current that creates an opposing magnetic field. Additionally, it is mentioned that current and flux will have a similar shaped graph over time if there is no magnetic saturation. Finally, the equation Φ=LI is brought up, indicating that flux is proportional to current.
  • #1
TT0
211
3
So I learned that voltage/emf is proportional to the negative change in flux so the graph of the voltage is the negative derivative of the flux graph.

What is the relation between flux and current. In a motor, a change in flux induces a current that creates an opposing magnetic field, and since current is proportional to magnetic field strength, does that mean flux is proportional to current in the coil. So does this mean current and flux will have a similar shaped graph over time?

Thanks
 
Physics news on Phys.org
  • #2
I didn't follow your motor example. Which motor are you talking about?
TT0 said:
So does this mean current and flux will have a similar shaped graph over time?
Yes, but only if there is no magnetic saturation.

Φ=LI, where L is the inductance of the coil, which is a constant.
So, flux∝current.
 

FAQ: Relation between current and flux

What is the relationship between current and flux?

The relationship between current and flux is described by Faraday's law of induction, which states that the induced electromotive force (EMF) in a closed loop is equal to the negative rate of change of magnetic flux through the loop. This means that as the magnetic flux through a loop of wire changes, it will induce a current in the wire.

How does current affect magnetic flux?

The amount of current flowing through a conductor can affect the strength of the magnetic field it creates. This, in turn, can influence the magnetic flux passing through a surface. As the current increases, the magnetic field becomes stronger and the magnetic flux also increases.

Can the direction of current affect magnetic flux?

Yes, the direction of the current can affect the direction of the magnetic field and therefore the direction of the magnetic flux. For example, if the current flows in a clockwise direction, the magnetic field and flux will also be in a clockwise direction.

What factors can affect the relationship between current and flux?

The relationship between current and flux can be affected by various factors such as the strength of the magnetic field, the number of turns in a wire, the area of the loop, and the speed at which the magnetic field changes, among others.

How is the relationship between current and flux used in practical applications?

The relationship between current and flux is used in many practical applications, such as generators, transformers, and motors. These devices utilize the changing magnetic flux to induce a current, which is then used to generate electricity or produce motion.

Similar threads

B Understanding magnetic flux change during the falling of magnet
Replies
1
Views
981
I Mutual inductance in a transformer
Replies
16
Views
2K
I Speed of magnetic flux propagation?
Replies
3
Views
855
I How induction works within a coil (nuances of it)
Replies
6
Views
433
Is current proportional to emf
Replies
2
Views
2K
I Power Loss Due to An Eddy Current
Replies
3
Views
2K
Induced current in a coil from a constant uniform magnetic field?
Replies
5
Views
1K
PPMT, Magnetic Flux Switch, electro-permanent magnet generator
Replies
8
Views
3K
The EMF induced in straight current-carrying conductor
Replies
10
Views
3K
I Iron core barely boosting field strength
2
Replies
43
Views
4K

Hot Threads

Recent Insights

Back
Top