All Questions
Tagged with electromagnetism inductance
101
questions with no upvoted or accepted answers
1
vote
1
answer
44
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Back EMF in electromagnetic coil
I am trying to quantify the back EMF generated while actuating an electromagnetic coil, this would be included in a general calculation to estimate the coil output under a variety of conditions. My ...
- 11
1
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0
answers
38
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Equation relating the current carried by a solenoid to the force experienced by a magnetic dipole?
I am trying to find an equation or a series of equations that relates the current I carried by a solenoid of length L with turns N to the force F experienced by a magnetic dipole of strength M that ...
1
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0
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131
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Coilgun projectile force calculation
Please excuse me if I am completely wrong because I am a 9th grader but I hopefully am able to explain briefly about my problem. I was trying to create a function to calculate the Force of an iron ...
- 11
1
vote
2
answers
78
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Telegraphers' equations for lossy transmission line when $R$, $L$, $G$, and $C$ are frequency dependent
The telegraphers' equations are commonly written as
$$\frac{{\partial v(z,t)}}{{\partial z}} + R\space i(z,t) + L\frac{{\partial i(z,t)}}{{\partial t}} = 0$$
$$\frac{{\partial i(z,t)}}{{\partial z}} + ...
- 11
1
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1
answer
73
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Mathematical expression for self-inductance constant $L$?
Is there a mathematical expression for what the value of $L$ (self-inductance constant) is for a given geometry? I've tried to come up with something, but I don't know if it's right or not...
$$\phi_B=...
- 187
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0
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112
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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 ...
- 101
1
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1
answer
58
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Does the presence of a disconnected coil nearby affect the self-inductance of a coil under test?
Picture two coils in close proximity. They have the same dimensions and are located co-axially, with a small gap between then (like Helmholtz coils, but much closer together than in the standard ...
- 111
1
vote
1
answer
250
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Current through a capacitor in AC Circuits
I'm a little confused on the equation for the instantaneous current through a capacitor in AC circuits.
My textbook has it as:
$$i_C = \omega CV \ cos(\omega t + \pi/2) = -\omega CV \ sin(\omega t)$$
...
- 111
1
vote
1
answer
182
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Are we always allowed to treat an inductor as a battery with the same voltage?
When there is an induced emf, Kirchhoff's Loop Rule no longer is true, because electric fields are nonconservative when there is an induced current, as stated by Faraday's Law:
However, I have seen ...
- 323
1
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1
answer
148
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Definition of inductance and volume currents
If I have a uniform, infinitely thin current. The relationship between inductance and current by definition is:
$\phi_{B} = L I$
Where inductance($L$) the proportionality constant between a wires ...
- 6,636
1
vote
1
answer
140
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Do transformers return current to source when magnetic field collapse at primary coil?
When we close the circut containing an inductor and a battery, the current starts flowing, which builds magnetic field around inductor, changing magnetic field produces its own current in opposite ...
- 129
1
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0
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64
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Inductance and Mutual inductance
Question: Three coils with inductances $L_1, L_2$ and $L_3$, as well as mutual inductances $M_{12}, M_{13}$ and $M_{23}$ are connected in series. What is the total inductance?
The right answer is $L_1+...
- 13
1
vote
1
answer
90
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Question on Faraday's Induction Experiment
We all know that moving a magnet through a loop of wire induces a current, like in this youtube experiment here. Similarly, we know that moving one solenoid (with a battery hooked up) through a larger ...
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1
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0
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144
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Deriving solenoid inductance using Faraday's Law
The inductance $L$ of a long solenoid of length $\ell$, cross-section area $A$, and turns per length $n$ is given by:
$$
L = \mu_0 n^2 \ell A
$$
where $\mu_0$ is the magnetic constant.
I am currently ...
- 111
1
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0
answers
56
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Velocity of an Object Accelerated by an Inductor
I am currently trying to build a coil gun as a class project (for an introductory programming/electronics class), and I want to be able to determine the launch angle necessary to send an object a ...
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