# 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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### 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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### 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 ...
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 ...