The inductance tag has no wiki summary.
2
votes
2answers
85 views
How to find $\tau$ in this circuit?
1)
2)
I know, that
$$
τ = \frac{L}{R}
$$
but what is $R$ in this formula? It seems to be the total resistance, but how to find it in 1) and 2)?
2
votes
1answer
43 views
Circuit Loop Law Doubt
In a circuit with a solenoid/inductor and a resistor and a battery .
Books say that $\Sigma \Delta V=0$ around a closed loop . That means work done by electrostatic field per unit charge is $0$ ...
0
votes
0answers
22 views
How to maximizing inductance of solenoid using Optimization method? [closed]
My teacher told me to maximizing inductance of solenoid using Optimization method, and I don't know how to find it if you know please answer me quickly as possible.
Hypothesis: length$=1m$, ...
0
votes
0answers
22 views
Current distribution in inductors
I have been trying to figure out how current is distributed in a circuit with multiple inductors. I could not find any specific info regarding the topic but I guess it is similar to the case with ...
0
votes
1answer
52 views
Self Inductance and Mutual Inductance
Systems have mutual inductance and self inductance-however won't the effects of these two effect each other as well?
Do systems undergo current and magnetic field behavior that are, in this way, ...
0
votes
0answers
25 views
Purcell and Self-Inductance
In the second edition on page 282, I'm not sure what is meant. Purcell argues that finding the self inductance of a wire loop is difficult because of the divergence of the B field at the wire, however ...
3
votes
1answer
49 views
inductance value of a single turn thin circular coil
the question may seem simple but I haven't found any fitting formula yet. The problem is the following:
consider a single-turn, circular coil made of reasonably thin wire (diameter of the wire much ...
2
votes
1answer
94 views
How we approach RLC circult from RLGC model?
In the text, it introduces a practical model to investigate a transmission line (like BNC cable), it considers the transmission line has resistive $R$, inductance $L$, conductance $G$ and capacitance ...
5
votes
3answers
230 views
Faraday's law - does the induced current's magnetic field affect the change in flux?
I've had this conceptual problem with Faraday's law and inductance for a while now.
Take the example of a simple current loop with increasing area in a constant field (as in this answer). So ...
0
votes
0answers
34 views
Inductors and Current in Circuit [closed]
I was having trouble in my AP Physics class. I have a test tomorrow and for some reason, even after reading the book, I can't answer these practice questions. Can anyone please tell me how to do them? ...
2
votes
2answers
79 views
What is the maximum power available from a magnetic field?
I just want to validate something I inferred from studying Griffiths (1999).
The instantaneous magnetic field $\vec{b}(t)$ at a distance $r$ from a long infinite conductor carrying a current $i(t)$ ...
0
votes
2answers
69 views
Where's the energy in coupled magnetic fields?
Suppose I have two identical current loops superimposed upon one another, but with their currents in opposite directions. The coefficient of coupling $K=1$, and therefore the mutual inductance $M ...
5
votes
1answer
163 views
Why doe we not get a shock on induction cooker?
In induction cooking, eddy currents in cook-pot cause heat to be produced. But why do we not get a shock?
Also, why is it that current is converted to heat while it has a good conductor(say, steel) ...
0
votes
1answer
92 views
Inductively coupled DC circuit
The circuit under consideration has two inductively coupled loops, one with a DC battery, inductor, and resistor in series. The other loop has two inductors, one inductively coupled to the first, the ...
2
votes
1answer
385 views
Effective resistance of inductor
In a lab experiment, we connected a simple circuit: an AC voltage source, connected (in series) to a variable resistor and an inductor. We measured the current in the circuit, and the voltage that ...
4
votes
2answers
350 views
How to calculate required current and specifications for a “wet coil” to generate x Tesla of magnetic field?
A water management project requires a "wet coil" (coil will be submerged in aqueous media) designed to generate a steady-state electromagnetic field of adjustable magnetic magnetic flux density at the ...
2
votes
3answers
356 views
Find Inductance in a Coil
Question: An inductive coil has an internal resistance of 20 $\Omega$. When an AC Voltage source with a frequency of 100 Hz is connected to the coil, the current lags the voltage by 30 degrees. What ...
0
votes
1answer
295 views
Mutual Inductance and the Dot Convention
Can anyone please explain me, the dot convention in coil systems (Mutual and self inductance) with some related images to understand..?
0
votes
0answers
194 views
Ewings Molecular Theory of Magnetism & Induction Cookers
This question regards Ewings molecular theory of magnetism
I.) Ewing's molecular theory of magnetism describes every magnetic substance as being a collection of dipoles that are initially in a state ...
1
vote
2answers
265 views
How can a non-conservative field be a scalar multiple of a conservative field?
Okay so I was reading this from University Physics by Freeman and Young and on the topic of inductors as circuit element, they wrote that $\mathbf{E_c} + \mathbf{E_n} = 0$ which makes no sense to me
...
1
vote
2answers
140 views
Can inductance or resistance be negative or “infinite”?
Since the potential different or voltage drop is positive (am I allow to say voltage drop or potential difference in the presence of a changing current?), the current flows from right to left since ...
1
vote
1answer
317 views
Non-conservative Electric Field
I was watching this video from Walter Lewin and while watching these two videos, I noticed there is a "contradiction" in what he is doing. All links direct you exactly to where he begins, so you don't ...
2
votes
2answers
398 views
A wobbly pan on an induction cooker, is it less effective?
According to the Wikipedia, one of the limitations of the induction cooker is that the bottom surface of the pot should be flat.
Accordingly, I commented on a question on Seasoned Advise, but I'd ...
0
votes
1answer
125 views
Is it possible to make an RFID-like device which responds to a metal detector?
Would it be possible to make a small device which can be easily detected with a metal detector (or similar) from several feet away?
It would need to operate kind of like a shop-security tag but it ...
36
votes
7answers
2k views
Cyclist's electrical tingling under power lines
It's been happening to me for years. I finally decided to ask users who are better with "practical physics" when I was told that my experience – that I am going to describe momentarily – prove that I ...
2
votes
2answers
254 views
Maximize Magnetic Self-Inductance Through a Wire
You are given a long length W of copper wire. How would you arrange it to obtain the maximum self-inductance? Why?
I am trying to use the equation
$$L=\mu_o n^2 l A$$
I try to solve it using a ...
2
votes
1answer
503 views
Inductor with controlled temperature coefficient
Let's assume we have an air-spaced inductor made of copper wire.
As temperature changes, due to thermal expansion of physical dimensions of the coil, its inductance changes too.
1) Is there a way to ...
0
votes
0answers
37 views
Is inductive heatings heating force proportional to the electron that flow through the inductive coil? [closed]
How does induction work, and why can't regular magnets cause induction if magnetism is another form of electricity?
2
votes
2answers
2k views
Relationship between inductance and number of turns in a coil in loudspeaker
I am in the process of designing a loudspeaker and have a question regarding the number of turns in the multilayered solenoidal coil and the speaker impedance of $8\:\Omega$. I understand that the ...
2
votes
2answers
161 views
Drum head coupled with an RLC circuit
I'm thinking about the possibility of an electroacoustic drum that would be tuned with some kind of RLC circuit.
The drum head would have an electromagnet attached to its center, which would be ...
2
votes
1answer
206 views
Induction and Halbach Array
I have recently studied and tried to understand the concept of the Inductrack ( http://en.wikipedia.org/wiki/Inductrack ), a form a magnetic levitation.
In the following link they present three ...
1
vote
1answer
164 views
Would a strong diamagnetic material exhibit inductance?
Erm. This question got shot-down in electronics.stackexchange.com and somebody recommended I raise it on here, so ...
Do metals with the property of strong diamagnetism also exhibit inductance?
...
2
votes
1answer
223 views
Practical physics: where does this current come from?
It's been a while since school and I don't remember the right laws and formulas. So I come here. :)
I've got a power cord extender running from the wall outlet to my washing machine. It's about 3 or ...
6
votes
4answers
3k views
Derivation of self-inductance of a long wire
Currently I am stuck, trying to derive the self-inductance of a long wire. According to literature it should be
$$L=\frac{\mu_r\mu_0l}{8\pi}$$
and in literature its derived by looking at the energy ...
2
votes
1answer
241 views
Are inductance and self-inductance synonyms?
Wikipedia mentions that the word self in the word "self-inductance" is to differentiate it from "mutual inductance". But it does not state whether the two things are the same thing. So do the both ...
