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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1answer
16 views

Effect on phase angle due to resistance

When an ac voltage source is applied to a resistor, current and voltage are in phase in the circuit. When an ac voltage is applied to a pure inductor, voltage leads the current in the circuit by 90 ...
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31 views

Explanation of behaviour in calculation of mutual inductance between two circular coils [closed]

I am working on calculation the mutual inductance between to coils in a project concerning power transfer. At the moment I am working on analyzing the mutual inductance between two coils but I am ...
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2answers
59 views

Contradiction using amperes law to calculate magnetic field $B$

I am trying to study the influence on the magnetic field B generated by a solenoid in two different cases the solenoid is wound around an open iron core the solenoid is wound around a closed iron ...
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1answer
30 views

Inductor real charcaterstics when connected to an ac supply

When we connect a dc source to an inductor we always use a resistor there so after solving that RL D.C. circuit we find an exponential function (e to the power R/L based) But when we are considering A....
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3answers
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I'm worried about current in an inductor at $t=0$ when it is connected with a DC source

When I connect a dc battery to an ideal pure inductor i think the voltage across inductor should be infinity. Because the rate of change of current should be infinity.because in no time say in $0$ ...
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31 views

Inductor with ac supply

When an ac source is connected with an inductor we have a continuous change in voltage and current across the inductor. According to farady and lenz law we will get an equal and opposite voltage ...
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20 views

Resonant and non-resonant terms in $RLC$ cirquit

I have tried to solve a differentials equations of a RLC circuit. In the the solution I have terms proportional to $e^{iw_0t}$ and $e^{-iw_0t}$, where $w_0= \sqrt{1/LC}$. The author proposes in the ...
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1answer
23 views

Energy Loss in an Inductor

I have a question about an ideal inductor. I understand the induced EMF due to moving charge and the more turns of an idealized inductor the higher the non-conservative induced emf is opposing current....
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3answers
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Phase difference between source voltage and inductor voltage

What will be the phase difference between the source voltage and the inductor voltage? Will the two voltages be in phase or will be out of phase. How much out of phase they will be? Note that there ...
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379 views

Why complex numbers are used in electronics? [duplicate]

The impedance of a capacitor or an inductor is imaginary. How do we know these quantities are imaginary?
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38 views

Velocity of an Object Accelerated by an Inductor

I am currently trying to build a coil gun as a class project (for an introductory programming/electronics class), and I want to be able to determine the launch angle necessary to send an object a ...
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1answer
19 views

Does inductance depend on a bias field?

Considering that the energy $U$ stored in a magnetic field $B$ is scales as $U \propto B^2$. It is clear that if we have two identical coils (same number of turns, area and length), but with opposing ...
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How do i calculate the magnetic dipole moment of a solenoid?

I would like to calculate the magnetic dipole moment of a solenoid. I have the number of loops, current running through, material type and cross sectional area. Any help would be greatly appreciated. ...
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Motion of a magnet inside a solenoid

I have a homework problem where a bar magnet is placed halfway inside a horizontal solenoid. A cut away shows that the magnet's north pole points to the left of the page and the south pole is outside ...
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1answer
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Analysing self-inductance per unit length at different locations inside a solenoid

I learnt that the self-inductance $L$ of a long solenoid is given by the following formula: $$L=\mu_0n^2\pi r^2 l$$ where $n$ is the number of turns per unit length, $r$ is the radius and $l$ is the ...
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Significance of sliding switch in a LR circuit

The following image and statement are from my textbook Concepts of Physics on the chapter "Electromagnetic Induction", topic 38.6 "Growth and decay of current in an LR circuit", sub-topic "Decay of ...
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Faraday's law for a 3D solenoid

Faraday's law is given for a 2D loop and is often expressed for a solenoid with N turns as: $$ N\oint _{C }\mathbf {E} \cdot \mathrm {d} \mathbf {l} =-N\int _{S}{\frac {\partial \mathbf {B} }{\...
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Mutual Inductance in more than two objects

I was working on problems with mutual inductance out of Griffiths and it seems we always talk about the mutual inductance between two objects. It seems however, that in principle, we should be able ...
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Calculating the internal inductance of a long wire without the concept of flux linkage

I did read the following questions: "Flux linkage inside of a conductor", "Derivation of self-inductance of a long wire" and "Trouble understanding fractional flux linkage" The answers to them are ...
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Mutual Inductance per unit length of two infinite parallel wires

I have two infinite wires carrying current $I_1$ and $I_2$ in the same direction separated by distance $a$. I want to calculate the mutual inductance per unit length for the two wires. Here is how I ...
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1answer
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How do I derive the frequency of oscillation of the capacitor voltage? [closed]

The formula is $$\omega= \frac{1}{\sqrt{L \times C}}.$$ How do I derive this?
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2answers
44 views

Attenuation of a signal

Suppose that I have a wire between two terminals and I want to send a high frequency ($f$) signal from one to another. Is the inductance and capacitance per unit of distance enough to calculate the ...
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1answer
36 views

Why do the inductance calculated from the simple solenoid formula and the Lorenz formula give such different results?

I am trying to understand the different formulae out there for calculating the self-inductance of a solenoid given its geometry, and am trying to resolve a discrepancy. The simplest case is that of a ...
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65 views

Work done by induced electric field in an inductor

Let us say the current in a circuit is increasing at time t=0. This circuit has an inductor (current enters the inductor from left) which opposes this increase in current. I know that the inductor ...
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1answer
54 views

Quantization of a waveguide: he only has one of the two E.O.M in his Lagrangian. How can the quantization be correct?

I am following this reference, appendinx C and D, around page 61 The goal is to quantize electric of current of propagating wave in a waveguide. Classical E.O.M: We model a waveguide by a ...
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1answer
42 views

Lagrangian of $LC$ oscillator: where is encoded the fact that ($U$, $Q$) and ($U$,$\dot{I}$) are proportional?

Consider an L.C circuit with no driving. The equation of motion is, with $\omega_0=\frac{1}{\sqrt{LC}}$ $$ \ddot{Q}+\frac{1}{\omega_0^2} Q = 0$$ We can show that the following Lagrangian correctly ...
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1answer
28 views

Understanding the physics of inductors

If an inductor "stores energy in a magnetic field", what does that mean exactly? It sounds like there's an invisible force field emanating from the coil or orbiting around the wire. As if electrons ...
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1answer
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Square loop moving into an homogenous magnetic field. How do i define the area as a function of time? [closed]

Looking through some old exams i found this problem where im supposed to derive an expression for the induced emf, ${\mathcal {E}}$(t), of a square loop moving into an homogenous magnetic field and ...
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2answers
55 views

LR circuit , deriving $I(t)$ [closed]

Question Statement Let the switch remain open a long time and then be flipped closed at $t=0$. Find the current $I(t)$ for $t \ge 0$. Note that it is necessary to consider the complexity of the ...
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2answers
58 views

Inductor and inductive impedance

In a purely inductive circuit supplied by a AC voltage source the inductive impedance offers resistance to the flow of current. So there must be some power loss like a normal resistor ($I^2R$) does ...
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1answer
25 views

Transformers and basic inductor physics

1) Why does resistor reduce the lag in a RL circuit? I understand why current lags by 90° with the voltage across the inductor. (After watching this) But I don't understand why that lag, would be ...
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1answer
42 views

How to demonstrate the inductance of an inductor?

I have some troubles to demonstrate this formula. Actually my problem is about how the length of the coil is integrated in the formula... I could understand, that the electromotive force $V_L$ is ...
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1answer
27 views

AC voltage source applied to an Inductor

Suppose an ideal case where an ideal voltage source is connected to an ideal inductor with no resistance. Everytime the voltage changes from the source the electric field in the circuit changes. The ...
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2answers
67 views

Inductors in an AC circuit

I have read that inductors oppose change in current flowing in the ac circuit. For example, when current starts increasing it induces an emf in the opposite direction to oppose the current from ...
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1answer
49 views

Confusion regarding inductor connected to an AC source

Suppose I connect an inductor to an ac source. Now a time varying current is produced and this causes change in magnetic flux linked with inductor coils and hence an induced is generated. But why ...
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1answer
26 views

How the total energy of a LC oscillator remains unchanged while placing a coil near the inductor of the LC oscillator?

If the capacitor is initially charged with Q charge and then conected to a inuctor then discharging takes place and the energy stored in electric field gets converted into the energy stored in ...
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2answers
48 views

Conducting loops attracting each other

The problem is the following Two identical, perfectly conducting loops are far apart and share the same axis. Each has self-inductance $L$ and a current $I$ flowing in the same direction, so the ...
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1answer
27 views

Back emf in an Inductor with an A.C supply

If a pure inductor is supplied with an AC voltage we will always have AC current and time changing electric field in the circuit. That always changing electricfield will cause changing magnetic field ...
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Magnetisation by a material core

I was studying magnetisation and magnetic field intensity in my NCERT physics textbook. I came across a statement which says that - If the interior of the solenoid is filled with a material with ...
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2answers
114 views

Changing the charge on a capacitor in an LC circuit?

I'm working on a problem that asks about doubling the charge on an LC capacitor: An ideal capacitor, with initial charge $Q$, is connected in series to an ideal inductor to form a series LC circuit....
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2answers
47 views

Current in a resonant circuit using complex impedance

I tried to obtain the current $I(t)$ of the shown resonant circuit using complex impedance. The inductor and capacitor have impedances $i\omega L$ and $\frac{1}{i\omega C}$ respectively. Using ...
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49 views

Voltage in an Inductor

When an inductor is connected with a voltage source we get equal and opposite voltage on inductor against the source voltage. That equal and opposite voltage gradually decreases with time which allows ...
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1answer
75 views

How Are Electromagnetic Waves Produced?

How EM waves are produced say by a capacitor of an LC circuit here if $E$ is increasing in upward direction? My thoughts Thought 1:- If E is increasing E flux is increasing thus B field must be ...
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2answers
73 views

How can current flow in a circuit if back emf is equal and opposite to applied voltage?

Ok, I've seen this question on this site before and other forums as well. A similar argument can be made if a resistor is connected to a voltage source through wires. The voltage across the resistor ...
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1answer
39 views

Energy Stored In Superconductor

I have two questions regarding this topic: What is the equation to calculate the energy stored in a superconductor when you apply a current. I’ve been looking it up and have been getting ...
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1answer
32 views

Why exactly does a current flow in an inductor oppose itself

So, I've understood that a current flow in an inductor produces 1) The original magnetic field along the direction of the curl E of the inductor. 2)Change in the magnetic field along the opposite ...
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3answers
51 views

Sum of Voltage in RCL circuit (AC supply)

In an RCL circuit, How can sum of voltage across each component (that is resistor, inductor and capacitor) be greater than the peak value of AC voltage supply?
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Incorporating the self resonance of an LC filter

I've been looking at lumped-element on-chip LC filters, like the one discussed in the paper Circuit Quantum Electrodynamics Architecture for Gate-Defined Quantum Dots in Silicon by Mi et al. from 2017 ...
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2answers
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Contradiction about the direction of magnetic force

I have encountered two contradictory directions for the force felt by current in a wire immersed in a uniform magnetic field. Halliday says the force should be to the left in the situation pictured ...
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1answer
27 views

Can Copper wires be used to increase linear acceleration of a ball within a circular pipe?

Imagine you have a metal ball within a pipe and copper wire wrapped around the pipe , wherein the pipe is connected circular. Can I pass current through the copper wire such that the linear ...

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