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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An RLC series circuit with current equal to one half the resonant current [closed]

Consider a RLC circuit coupled in series supplied by the AC voltage v= 30 sin(w t), R=50 W, L= 600 mH, frequency f=5 kH. The inductor is a solenoid and the capacitor has cylindric configuration. The ...
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How can this circuit be simplified in the first moments after the circuit breaker closes?

The book states that in this circuit after the transient the branch with the capacitor can be ignored while the branch with the inductance can be considered constituted only by a resistance. This ...
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Good braking system for a mini car that can be triggered by a beam above the car that it will go past

I want to create a braking system for a mini car (essentially an aluminium body around 30cm long with 2 sets of axles with wheels (laser cut circles) connected to the end of each axle on the front and ...
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Work done by battery [closed]

In charging a capacitor to a charge $Q$ Is there an equivalent to this in setting up current through an inductive circuit? Energy stored in inductor $= 1/2Li^2$ What would be the work done in setting ...
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Current in primary circuit when diode in secondary circuit is reverse biased

Let's say we have an ideal transformer with a diode in the secondary circuit: If the diode is reverse biased, there would be no current in the secondary circuit, which would mean that there is no ...
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How can it be justified that the phase difference between voltage and current for inductor is $\pi/2?$

The inductor is an ideal one, the phase difference is with respect to current, and the voltage varies by the law $V=V_Lsin(\omega t).$ One can prove that the current function will come out to be $I=...
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What is the difference between the self-inductance of a branch and self-inductance of a loop in lumped circuit models?

When we talk about lumped circuit model, I get confused about the terminology that is generally used. For a loop, we do know that the total flux through the loop can be written as $\Phi = \Phi_{ext} + ...
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LC circuit in spring system

We have a setup of a metal spring with a mass. This would oscillate nicely. Additionally, an inductor with a capacitor also oscillates nicely. If we were to combine these two setups, where the mass is ...
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Electric flux in inductor

An AC circuit is set as follows The circuit consists of a voltage source, an ideal inductor with inductance $L$ and a ideal capacitor with capacitance $C$. The current through the circuit is $i(t)= ...
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Effect of varying length of solenoid coil on magnetic flux

Given the number of turns (N) and current is constant for any cross section of the coil, does varying the length of the coil not have any effect on the magnetic flux in the centre of the coil? i.e. a ...
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Inductance in AC circuit

Why does an inductor oppose a change in current and not voltage? Is it a rule or is it because of lenz's law? Because intuitively the back e.m.f which opposes a change in current should also oppose a ...
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How long of a wire do i need to construct a solenoid of $N$ turns? [closed]

Consider an MRI scanner with a hole diameter of $60 ~ cm$ and producing a field of $B_{0} = 1.5 ~ T$ and has a length of $50 ~ cm$. Furthermore, let us assume that the remanence of a permanent magnet ...
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Why can voltages be summed around a circuit if there is magnetic induction?

So there is this class I'm attending on Electronic Instrumentation which involves mostly circuit analysis. For example, RCL circuits, and circuits that also contain opamps, transistors, diodes, etc. ...
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Solenoid emits electromagnetic radiation, why? [closed]

A sinusoidal electric current is applied to the solenoid. The solenoid emits electromagnetic radiation, why?
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Is their an inherent flaw in using a step down transformer for a coil gun

I am currently in my first year of an engineering program so just recently learned about the many wonders of electromagnetism. For a school project this year I went on to build a coil gun using the ...
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Magnetic potential energy solenoid explanation

When the solenoids magnetic field is disaligned completely with the external magnetic field, it is said to have a higher potential energy associated with it. This makes sense since there is a ...
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Difficulties in modelling magnetic levitation system? [duplicate]

I'm currently working on a project surrounding magnetic levitation with an electromagnet having to levitate an object underneath itself. I have taken a look at research papers, examined their ...
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Quality factor of LCR circuit

If we are given a parallel or series LCR circuit, we know the quality factor of these circuits ( which we can see in many books). But if we are given a LCR circuit with the three components connected ...
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Find the inductance of the coil by potential difference of the circuit [closed]

A coil is connected in series with a 10.0 k$\Omega$ resistor. An ideal 50.0 V battery is applied across the two devices, and the current reaches a value of 2.00 mA after 5.00 ms. Find the inductance ...
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How many Tesla can stop 1 Sievert?

The SI unit of Magnetic field is Tesla. The magnetic field of Earth blocks all the radiation coming from space which is measured in Sievert. I'm designing a solenoid that can counter the radiation ...
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Is self-inductance dependent on geometry? Is $\Phi$ net flux or just flux due to cirucit?

Self-inductance of a circuit is defined as $L=\frac{\Phi}{I}.$ But it is not clear what $\Phi$ (read phi) is. Is it net magnetic flux or flux due to the magnetic field created due to current in the ...
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Is it possible to have a situation where external magnetic field lines are inside a superconductor loop or a superconducting sphere?

As we know that magnetic flux in a superconducting loop flux cannot changed at all as resistance is zero often we see in books that superconducting material the external magnetic field are not shown ...
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Is it true that the mutual induction coefficient can be considered as a series of loops mutual inductance with the given loop?

Suppose we have a solenoid of length $L$ , radius $R$ in which a superconducting ring of radius $r<<R$ is placed in the axis of solenoid , consider a current is flowing in ring now take a loop ...
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What will the $M_{21}$ inductance signify here?

Consider a two conducting concentric rings one having radius $R$ and other $r $, $R>>r$. Now we know that mutual inductance can be easily calculated by running current in bigger one it would ...
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Why mutual inductance between two coil having $n$ numbers of turns per unit length in one coil is given by below formula?

Considee there is magnetic field generated by a solenoid having n number of turns per unit length , using that for calculating flux in a small conducting ring placed at centre of it the magnetic flux ...
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Self-induction and induced currents

I was reading the chapter about self-induction and inductance from "Physics for scientists and Engineers with Modern Physics, vol. 2, Eight edition - Serway | Jewett" and I can't understand ...
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Will adding a superconducting ring inside solenoid increases the inductance of it?

Consider a solenoid having $N$ turns and cylindrical length, a superconducting ring is placed inside having its plane perpendicular to axis of solenoid, if ring (having self-inductance $L$) is very ...
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Inductance of a coil when the core has a gap

A coil of $N$ turns is wound on an iron core occupying a length $l$ of the core that has an air gap as shown in the figure. Mean length of iron in the core is $l_i$ and the length of the air gap is $...
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Why is the relation between voltage ratio and frequency a linear one in a lumped transition line?

In an experiment the cutoff frequency of a lumped transmission line is determined by measursing the ratio of the output/input voltages. The lumped transmission line is a ladder network of 40 ...
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Why does current lag behind voltage in an inductor in AC Circuit?

In a simple AC circuit with a source and an inductor, we have $$\Delta V + \Delta V_{L} = 0 $$ due to KVL where $\Delta V $ is the voltage source and $\Delta V _{L}$ is the voltage across the inductor....
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Question about the impedance of a RLC circuit

I made an experiment with a RLC circuit, and I found the resistance, the capacitance, and the inductance with measures. So I decided to calculate the impedance of the circuit, depending on the ...
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An *actual*, relativistic, intuitive explanation for inductance…?

I searched high and low, and as far as I can tell, after years, there is not a single video or site that actually explains inductance in an intuitive way. I mean an actual explanation. Not “Faraday’s ...
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Why does the same amount of current flow through both resistors after opening the switch S? [closed]

Why does the same amount of current flow through both resistors after opening the switch S?
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Solenoid with iron core

If I use a solenoid of $ h = 0.1\, \mathrm{m}$, with a current of $ I = 30\, \mathrm{A}$ , with $62$ turns and an iron core of permeability $\mu = 0.25$, then it will give me a magnetic field of: $$B =...
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Why does current reduce in step up transformer?

I have researched about it and found the laws everywhere as if lawyers have written those answer. I know the law of conservation of energy, but I don't want to think like a lawyer, I want to think ...
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How to determine the force from a solenoid exerted on the metal?

currently, I'm doing an experiment regarding the magnetic force from a solenoid. The formula that I was using was this: $$ F=\frac{(NI)^2\mu_0A}{2D^2} $$ And I found there was a huge difference ...
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What is the amplitude of current in LC oscillations

Since there is no resistance in an LC circuit (not attached to an AC source), what's stopping the current from rising to infinite. And if resistance is provided by the inductor by self induction, then ...
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For the transient response of an inductor in a DC circuit, how and why does the rate of change of current (with respect to time) to decrease?

When an inductor is connected to a battery, it is to my knowledge that a current will want to flow. However, as the current is quickly increasing from 0 the inductor will oppose this change. It does ...
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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 ...
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Steady state , Ohms law, Inductor circuit

$B_{\phi} = LI$ $\frac{\partial B_{\phi}}{\partial t} = L \frac{dI}{dt}$ $\epsilon = -L \frac{dI}{dt}$ Now, Let's say that my circuit has a battery, a wire and a certain inductance. The battery has a ...
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Relation of electric permittivity $ε_{0}$ and magnetic permeability $μ_{0}$ of vacuum space with capacitance $C$ and inductance $L$ of matter?

I am asking if the permittivity and permeability constants of vacuum space controlling propagation speed of electromagnetic energy, light, through vacuum space: $$c=\frac{1}{\sqrt{\varepsilon_{0} \mu_{...
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Problem with mechanical analogy in $LCR$ circuit

I read in Mechanics volume of Berkeley physics that $\ddot{x} + \frac{1}{\tau} \dot{x}+\omega_0^2 x = \alpha_0 \sin \omega t$ has the particular solution and it is easy to see that if $\mathcal{E}=\...
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How is EMF still induced in an incomplete/open circuit?

I understand that current can't flow through a coil if it is not complete, but surely this means that if a magnet is dropped through the coil, no EMF would be induced either, since work is done when a ...
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Is the voltage drop across an inductor in a purely inductive circuit equal to $X_L\times I$ or back EMF?

In a purely inductive circuit, due to Kirchoff's voltage law we say that voltage drop across the inductor is equal to (negative of) applied AC voltage. However whenever we calculate the voltage drop ...
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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 ...
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Why do we have to do work to remove iron nucleus from an inductor?

Why do we have to do work to remove iron nucleus from an inductor? Since the energy associated with the inductor is $E=\frac{Li^2}{2}$, and $L$ is proportional to relative magnetic permeability $\mu_r$...
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Why electrons accelarate in a solenoid?

The induced voltage in a solenoid equals to the applied voltage $U = L\frac{di}{dt}$. From that I conclude that the electric field generated by the voltage supply and the induced electric field cancel ...
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Inductor back emf

If I have that circuit, the equation that describe the circuit is: $\epsilon = L \frac{dI}{dt}$. Now, if the back e.m.f. is equal to the source e.m.f, how current can pass? and it should pass because ...
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What is the significance of Power factor?

I was studying the power in Alternating current. The formula to calculate the power in alternating circuit is $$P = VI \cos{\Phi} $$ where, $V$ and $I$ are RMS values of voltage and current and $\Phi$ ...
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Most efficient inductor : Magnetic Field

I don't know how inductance and the strength of the magnetic field produced in an inductor relate. The most efficient multilayer selonoidal inductor design (using a constant length of wire) is Brooks ...
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