Questions tagged [inductance]

The property of an electrical conductor through which a change in current through it induces an electromotive force in both the conductor itself as well as in any nearby conductors by mutual inductance. Also use more broadly for electromagnetic phenomena in solenoids.

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Circuit quantization of two coupled floating LC circuits

I'm trying to perform the circuit quantization of two coupled floating LC circuits. I am trying to do so using the most general coupling case, depicted as follows. I hope it is clear; essentially ...
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Series vs parallel solenoids

Something I'm sort of struggling to figure out. Let's say I have a given length of wire to make solenoids. I wrap it tightly in all cases and get some turns per distance $n$ that will remain ...
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Magnetic field strength just outside of a solenoid

From my understanding, the magnetic field inside a solenoid is constant, so at points C and D, the magnetic field strength is the same. Magnetic field strength outside solenoid is minimal and is ...
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A misunderstanding concerning self induction of an inductor

If there is an inductor in a certain electrical circuit, from Faraday's Law we know that $$ \oint \vec{E} \cdot \vec{dl} = -\frac{d\phi_{magnetic}}{dt}$$ I see everywhere that when doing this line ...
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Online Lab simulations for a Physics II course - resources and/or advices

I am designing a Physics II course (for scientists and engineers) for the next semester (Spring I or Spring II). I am looking for online resources for the Lab: ideally all laboratories will be held ...
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Intuition in an LR circuit — Why does rate of increase in current decreases with time?

Consider the below LR circuit. The current law for the circuit is: $$i=\frac VR(1-e^{- \frac {Rt}L})$$ And Voltage across inductor is: $$L\frac {di}{dt}=V(e^{-\frac {Rt}{L}})$$ This means that the ...
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Why back emf in an inductor reduces gradually?

In an inductor if there is current supply, flux associated with it increases generating emf opposing voltage supply. Now flux remains constant for a smallest time interval, so back emf reduces, which ...
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Is an infinite amount of heat is produced in an L-R circuit? [closed]

Consider a simple L-R circuit. When I tried to find heat generated in an L-R circuit, I got the result as, mathematically speaking, the work done by the battery, and the heat produced in the resistor ...
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What does the metres squared represent in the dipole moment?

If I were to do an experiment measuring the magnetic field strength (in tesla) of an iron core solenoid magnet, how would I determine the value for the dipole moment in the formula displayed in https:/...
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Energy stored in an Inductor is used to move electrons

I was reading about the energy stored in an Inductor and first of all I had the question that is this actually stored? The inductor produces a magnetic field which exerts a force on electrons. Isn't ...
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Would the following 2 solenoids repel or attract each other? [closed]

Question: Describe what will happen to two solenoids that are arranged next to each other as shown. The solenoids are the same length, and have the same number of turns and current flowing through ...
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Are resistors, inductors, capacitors the only possible passive components in this universe?

I wonder whether or not there is a possibility to find another passive component (with value either $X$ or $Y$) that will change the well known RLC circuit equation below $$ L\; \frac{\mathrm{d}^2 \; ...
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Does the magnetic intensity of a iron core solenoid follow the inverse square law at distance r from the centre?

If I had an iron core solenoid, and was able to measure the force at different distances by say, using a piece of metal attached to a string on a scale, and knew current and other properties of the ...
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Question on Ampere's Law and Solenoid

Just came across magnetic field inside a solenoid and amperes law. Amperes law says that dot product of magnetic field and distance from current would give us the $\mu_p$ times the current enclosed. ...
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Solenoid Length In Inductance Formula

For a long solenoid, when the formula describes solenoid length, is it referring to the length of the wire wrapped around the magnetic core or the length of the core?
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Triangle function generator across solenoid and Ohm's law

Suppose an open-air solenoid (known length, winding density, resistance, etc. etc.) has its two terminal connected to a function generator. The generator has been outputting out a linearly increasing ...
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How does phase angle impact rms Voltage in an RLC Circuit?

I have an RLC Circuit set up, with a 12Ω Resistor (though the internal resistance of the entire circuit is an additional - approximate - 140Ω), 300 mH inductor, and 100 µF capacitor. There are ...
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Resonance frequency with metal

I've made an experiment with resonance frequency of a LC circuit. One part was to place a metal (I think iron) in the middle of the induktivity of LC circuit. I measured a higher resonance frequncy as ...
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Does Ohm's Law still hold in the presence of a time varying magnetic field?

Ohm's law is often motivated by the microscopic relation \begin{align} \vec{j} = \sigma \vec{E} \end{align} From this you can easily derive \begin{align} U = RI \end{align} , given that \begin{align} ...
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Why is my experimental inductive reactance not directly proportional to frequency [closed]

For a lab report, I am measuring the voltage across a 300 mH coil when connected to an alternating current supply at different frequencies. From this, I want to graph the inductive reactance (...
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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 ...
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Impedance RLC circuit

Why is the impedance of the inductor defined as $i\omega L$, and of the capacitor $\frac{1}{i \omega c}$ ? More generally, why are they complex numbers? Is impedance a mere mathematical tool?
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Confusion about analogous capacitor/inductor circuits

I have two idealized circuits which are duals of each other: one is a capacitor connected to a step current source and the other is an inductor connected to a step voltage source, pictured below. The ...
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Why does the current through an Inductor changes when the Inductor doesn't like the change of flux through it?

Consider the example shown above. Here we have connected an active inductor, in which the initial current is "I", to a resistance, with the help of a switch and close the switch at t=0. We ...
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Self-induction of a simple wire/circuit

I've been working as an EE intern for the past 5 months and have been trying to wrap my head around a couple concepts. Is the principle of self-inductance due to a circuit's inherent property of being ...
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What is the time constant of RLC circuits

I am trying to understand how to analyze and understand the $RLC$ circuit. I know that in $RL$ and $RC$ circuits there is time constant $\tau$ wich determine how long it will take to $I_{(t)}$ decress ...
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Does a charged capacitor weigh more than uncharged? [duplicate]

I know that charging a capacitor only moves particles from one plate to the other, so the total amount of charge in the capacitor does not change, nor does the total number of particles. However, the ...
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How does RF communication between electronic circuit elements affect the circuit?

The other day, a friend and I were looking at a simple resistor-capacitor-inductor circuit. As we were looking at the circuit, he mentioned that the capacitors and inductors "talked" to each ...
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Factors that affect Inductive reactance for AC current

If we have a dc circuit and a solenoid the current passing through it will be affected by the length of the coil because resistance in the circuit = (resistivity* wire length)/area of the wire.. so if ...
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Why we take the element $ds$ in self inductance of coaxial cable

I watched on a derivation of coaxial cable and when we want to calculate the self inductance per unit lengh we first find the flux of the magnetic field,so we take the integral $\int_{a}^{b}\vec{B}\...
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RLC - CLR - RCL Transfer function

I have problem because I don’t understand the difference between CLR RLC and LCR, they are the same no ? They have the same composant just placed in different ways, I did already found the Transfer ...
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LC circuit with dissipation [closed]

I know that the differential equation that describes this kind of circuit is $$\frac{d^2 q(t)}{dt^2} = -\omega^2 q(t) \, .$$ I was wondering how to model the case where we have dissipation of energy. ...
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Why the readings of wattmeter in both cases coming out the same even though they are connected at different places?

The value of resistance is 3Ω and inductor impedance is j4Ω. As far as I have learned the wattmeter measures instantaneous power but shows reading for average power. As I solved for the given values ...
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Product of Capacitance and inductance in parallel plates

I was solving this problem: I was asked to find the capacitance per unit length, which I did (in cgs units) $$C=\frac{w}{4\pi h}$$ and to find the inductance per unit length $$L=\frac{4\pi h}{c^{2}...
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What happens to an inductor if the stored energy does not find a path to discharge?

Suppose an inductor is connected to a source and then the source is disconnected. The inductor will have energy stored in the form of magnetic field. But there is no way/path to ground to discharge ...
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Self-induction in Transformer

In a transformer, If the circuit of the secondary coil is opened, then the emf of the source equals the induced emf by self induction in primary coil So what makes them equal? Is there a law that ...
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Are there analytical solutions for systems involving self-inductance and mutual inductance between two coils?

I have a real physical system where I have a moving coil inducing in a conductive (non-laminated) metal core. So I decided to model it, at each position, as being a system of 2 coils, one coil being ...
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Crossover filter gives weird results

I was analyzing results of an experiment on a crossover filter and I was trying to take into consideration the parasitic resistance of the inductor L (called $R_L$). I know the theoretical crossover ...
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How can I provide a solenoid with the current it needs to accelerate a ferrous projectile to a given velocity?

My question upon first glance looks quite elementary, however my specialisation in physics is not circuitry and such I am not sure of my calculations. A little bit of background: I am trying to ...
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When solving for Inductance of coaxial cable, why we don't take magnetic field inside cables into account?

I calculated, that unit legth inductance of coaxial cable is $L=\frac{\mu_0}{2\pi}\ln{\frac{R_2}{R_1}}$, where $R_1$ is the radius of inner wire and $R_2$ is inner radius of outer wire(conducting ...
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Two questions about an AC electric circuit: Have I interpreted the dots correctly and where does the negative sign come from?

So I am looking at two mutually coupled circuits that are not at resonance. In particular I am looking at a pair of electric circuits discussed on pgs: 259 - 261 of the book "Electricity and Magnetism"...
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Loop law and charge redistribution [closed]

Addendum: I have just read Strict(er) adherence to homework guidelines? and think that this is the reason why there have been three votes to close this topic. Notice, though, that I am not asking for ...
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To find the condition for maximum current and also the role of inductance in the given problem

If two spheres of different radii and at a large seperation from each other are given equal charges and then connected through a wire having resistance R and inductance L , then when will the currect ...
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36 views

AC current and voltage in an Inductor

This is the simulation of a RL circuit with an AC source. That AC source is connected with the circuit at the moment when the source voltage has zero phase angle with 5 volts peak. It can be seen ...
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Difference between short circuit current in inductor and ballistic current? Whether it is related to magnetohydrodynamics?

In my research, i want to achieve absolute negative resistance with idea from the reference "“Absolute Negative Resistance in Ballistic Variable threshold field effect transistor” with the ballistic ...
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How can be current increased with decreasing voltage?

Here are the voltage and current shown for the primary winding of a transformer or an ideal inductor when the voltage is sinusodial. My question is why the current is increasing when the voltage is ...
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Voltage and Current in an Inductor

When an ac source is connected with a pure inductor (when ac voltage is at its peak) then how it is possible that when voltage is decreasing current is increasing , when voltage is zero current is ...
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Inductor Behavior for Voltages

When a DC voltage source is connected with a pure inductor. And the switch is closed We get a change in voltage across inductor and along with it a also an attempt to change the current across the ...
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Self-Inductance of a ring: Total flux through ring

It has been shown here how to calculate self inductance of a circular ring, we can see that to calculate magnetic flux only magnetic field at the centre is considered, but we know that the flux is ...
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Inductance with unorthodox core geometry

Let's say I have a coil with a well known geometry and (therefore) inductance. And an object with a uniform magnetic permeability $\mu$ and known -but complicated- geometry. How can I calculate the ...

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