All Questions
Tagged with electromagnetism inductance
101
questions with no upvoted or accepted answers
4
votes
1
answer
401
views
Calculating the internal inductance of a long wire without the concept of flux linkage
I did read the following questions: "Flux linkage inside of a conductor", "Derivation of self-inductance of a long wire" and "Trouble understanding fractional flux linkage"
The answers to them are ...
- 211
3
votes
0
answers
194
views
Wave equation derivation in a transmission line
$$
V(x, t) = L\Delta x\frac{\partial I}{\partial t}(x, t) + \frac{1}{C \Delta x}\int{I_c(x, t) \; dt} \tag{1}
$$
$$
V(x + \Delta x, t) =\frac{1}{C \Delta x} \int {I_c(x, t) \; dt} \tag{2}
$$
$$
I(x) = ...
- 1,515
3
votes
1
answer
144
views
What do we mean exactly by inductance of two conductors?
I'll illustrate what I mean with a problem, but the question is not about this particular question. Instead I am looking for a general principle.
The problem is:
Calculate the inductance of a unit ...
- 326
3
votes
0
answers
123
views
Force vs Stroke for Open-ended Solenoid
If I understand correctly, the force (F) versus stroke (x) curve for a solenoid which is open ended (there is no plunger stop in the middle) is something like the curve below:
The plunger is forced ...
- 131
3
votes
1
answer
156
views
Dot convention inductors in series: what is going on
So I'm really confused with mutual inductors and dot convention. If your answer is going to be a link to any website I can assure I read them all and that only left me more confused. So here are my ...
2
votes
1
answer
67
views
Does parasitic capacitance contribute to the magnetic flux?
When modeling a real inductor, typically the equivalent circuit is the following one:
Source
A series resistance and parallel capacitor is added.
This model works very well to explain the following ...
- 187
2
votes
0
answers
63
views
Variation of Permeability with DC magnetising Field
For any Powder core, as DC magnetising field increases, the initial permeability decreases known as "permeability roll off".
For example for an MPP core-
For MPP cores the initial ...
- 21
2
votes
3
answers
72
views
If An Instantaneous Force Causes A Charged Particle To Briefly Accelerate, Does Self-inductance Decelerate It?
Consider the following example:
A charged particle initially at rest briefly accelerates in the forward direction due to an initial force. At this point the particle is carried forward only by inertia,...
2
votes
1
answer
287
views
Mutual inductance - induced magnetic flux in the primary
Let there be two coils, L1 (with self inductance L1), and L2, with self inductance L2.
The first coil is connected to a sinusoidal supply, and the second one is connected to a resistor load, as shown ...
- 21
2
votes
0
answers
116
views
Magnetic field due to a double tape line
I have been asked to calculate the inductance of a double tape line :
Now we know that $$ N\phi = LI$$
So let's calculate the magnetic field by assuming an amperian loop like this:
$$\int B.dl = ...
- 361
2
votes
2
answers
1k
views
Magnetic flux inside solenoid
Suppose that I have a small coil that is moved at a steady rate into a solenoid. The solenoid already has a current passing through (basically, it is an electromagnet). The small coil starts beyond ...
- 21
2
votes
1
answer
142
views
Does there exist a rigorous general mathematical proof for $M <\sqrt{L_1L_2}$?
Does there exist a rigorous general mathematical proof for $M <\sqrt{L_1L_2}$? Here $M$ is the mutual inductance between two conductors and $L_1$ and $L_2$ are their respective self-inductances. (...
- 261
2
votes
0
answers
1k
views
Why is the electric field inside a solenoid tangential?
I have been looking at some derivations for the electric field inside a solenoid. I know how to find it, but I don't get the symmetry argument used. This is often of the form:
Since if we choose a ...
2
votes
2
answers
11k
views
Calculating magnetic field strength for a very small electromagnet
I am trying to calculate the magnetic field (in tesla/gauss) of an electromagnet that is very small and has very few windings. For example 12 windings over 0.003 meters. I know this is not going to ...
- 301
2
votes
2
answers
1k
views
How Are Electromagnetic Waves Produced?
How EM waves are produced say by a capacitor of an LC circuit here if $E$ is increasing in upward direction?
My thoughts
Thought 1:-
If E is increasing E flux is increasing thus B field must be ...
- 335