All Questions
Tagged with electromagnetism inductance
383
questions
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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
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0
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49
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Finding the Magnetic Field within a solenoid
So, I have to find the magnetic field within a solenoid such that the field at a point(on axis) is half than that it would be at the centre. Length of the solenoid is 20cm and the current through it ...
- 11
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2
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444
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The direction of induced electric field around a changing current wire
I saw in my textbook that the induced electric field around a changing current wire is parallel to the direction of the current, for example:
Why is that?
Thanks!
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1
answer
109
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Can someone please clear this doubt regarding Lenz's Law?
In Lenz's Law or Faraday's Law of Electromagnetic Induction, whenever there is a change in magnetic flux in a solenoid due to an external magnetic field like an approaching magnet there is an EMF ...
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3
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194
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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
2
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1
answer
123
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Why is the product of the $L$ and $C$ matrices for coupled transmission lines diagonal?
Background - transmission line
$\newcommand{\ket}[1]{\left \lvert #1 \right \rangle}$
A transmission line can be modeled as an infinite sequence of inductors and capacitors:
...
- 24.6k
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178
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Pressing force of a solenoid
If a current is passed through bundle of loosely coiled, insulated wire the space between the wires rapidly contracts, crushing it down into a disk. How can this crushing force be calculated?
I know ...
- 57
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376
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What Exactly is Axis of A Solenoid? How does placing a soft Iron Core Along The Axis increase its Strength of Magnetic Field?
I have trouble understanding what is meant by axis of solenoid.
According to textbooks placing a soft iron core "along the axis of solenoid" increases the strength of the magnetic field of ...
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0
answers
23
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Magnetic Field Lines in a Circular Solenoid
We know about magnetic field lines in a circular loop and a solenoid. While studying them, I thought about how the magnetic field lines would be in a solenoid made circular by bending, forming ...
- 1
1
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2
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315
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Magnetic Field Produced by Solenoid
I was reading about solenoids and came to know that the magnetic field strength of a solenoid is greatly increased by
Increasing the number of turns in the solenoid coil (directly proportional to ...
- 229
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54
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Frequency response of ferrite filter
Why ferrite material only passes low frequency and blocks high frequency. I mean what's going inside this material which is leading to show such frequency characteristics?
3
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1
answer
440
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Inductance - a better analogy than the fact that it is similar to inertia
This question is to get a feel and good definition for what inductance actually is.
I have read about the analogy where inductance can be compared to inertia-that the flux through an inductor resists ...
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56
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Magnetic force exerted on an air core inductor
I'm trying to work out a weird case of the magnetic force exerted on a current-carrying loop, and could use some help understanding things.
suppose you have an air core inductor / coil, which, when a ...
- 1
2
votes
4
answers
241
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Inductor connected to an AC source
Consider an inductor connected to an AC source, $V=V_0\sin\omega t$.
Let the the switch in the circuit be closed at $t=0$. Then by Kirchoff's voltage law,
$$
V-L\frac{dI}{dt}=0
$$
where $I$ is the ...
- 23
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47
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Is the magnetic field outside a solenoid almost null for AC current?
Despite an answer to this thread, I'm not so sure the magnetic flux outside an infinite ideal solenoid is null whenever the current is AC. I've seen no real proof of that, and the Biot-Savart law ...
- 487