All Questions
Tagged with electromagnetism inductance
383
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Why are partial derivatives of Energy and Co-Energy with respect to x opposite numbers?
In a system where the flux linkage $\lambda = \lambda(x, i)$ is a function of dispalcement $x$ and current $i$.
Its energy is defined as
$$
W = \int_{0}^{\lambda} i(\lambda', x)d\lambda'.
$$
Its co-...
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2
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Intuition behind self-inductance
I'm having a little bit of a hard time understanding some concepts to do with self-inductance in class.
I understand mutual inductance. That's when a loop has some time-dependent current going through ...
- 187
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2
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Inductance of air core inductor with and without load
I have an air core inductor whose inductance , as measured with LCR meter, is 45.1uH and quality factor is 4.4. When i place an Aluminum alloy (which is a Non-magnetic Material) as Load inside the ...
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Why In the following $RL$ circuit, the connection to $b$ must actually be made an instant before the connection to $a$ Is broken? [duplicate]
In Resnick halliday, student 10th edition page - 795. In the topic current decay in RL circuit, the following statement is used, the connection to b must actually be made an instant before the ...
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63
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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
3
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1
answer
208
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What is the electric field around an inductor?
This question comes from this Walter Lewin video at 35:00 where he says "I'm going to confuse you even more" (and I suppose he somewhat succeeded). Walter Lewin claims there is an electric ...
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Defining magnetic flux in rotating cylinder
Suppose We have a charged rotating cylinder such that the magnetic field inside it is the same as a solenoid of the exact same dimensions. Obviously, the current per-unit length for both will be the ...
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Open to closed Inductance Behaviour
when an RL circuit is opened for a long time then closed at $t=0$, why is there a sudden jump in its change in current ($\frac{dI}{dt}$) the moment the switch is closed? And why is this value so large?...
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1
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Derivation of self-inductance of a long wire: Is my interpretation correct?
Derivation of self-inductance of a long wire
Flux linkage inside of a conductor
Flux linkage inside conductor
So many people asked the same question, yet no satisfactory answers. I tried to develop my ...
- 415
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What exactly is the formula of total flux linkage? Is it $dλ=dΨ *\frac{\text { Ienclosed}}{I}$ or $λ=N*Ψ$?
In Sadiku, he used the formula $dλ=dΨ *\frac{\text { Ienclosed}}{I}$
to determine the total flux linkage for coaxial cable for $ρ<a$ and for $a<ρ<b$, but I applied this formula for the ...
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Doubt in RL circuit and Kirchoffs law [duplicate]
We know that kirchoff's second law is based on the fact that in any closed circuit: $$\oint \vec{E}\cdot\vec{dl}=0$$
Now let us take a simple LR cirucit with one battery $E$,resistor $R$, inductor $L$....
- 2,042
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2
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667
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One solenoid inside the other
If I place one solenoid inside of the other, both of them in the same direction and same amount of loops, will the inductance be doubled or will it be zero?
user364391
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1
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111
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Doubt in the mode of action of inductor in the RL circuit
I feel that my initial question was slightly incoherent and not precise. So instead of making addendum to the question which is making it lengthier, I am editing it completely. So, sorry about that.
...
- 436
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188
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Inductance of wire over a ground plane: does it change with frequency?
Typically inductance is calculated in the framework of DC currents, i.e. magnetostatic conditions.
Then, the value of the inductance is adjusted for the case where the current is no longer DC.
One ...
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Current through a solenoid: magnetic field gives a staircase graph
We were running current through a solenoid coil with an iron core, and measuring the resultant magnetic field strength. We expected a purely linear relation for the "current-field strength" ...
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