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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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Cannot catch a minus sign mistake when deriving the ODE for an LC circuit

It's probably a very basic question but I just cannot wrap my mind around it. I'll just try to derive the differential equation for an LC circuit: According to the law of induction, in a solenoid we ...
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How to solve the transient response of a general $RLC$ network?

There is a $RLC$ network $\{V_i\}$ with a complex impedance $Z_{ij}$ on each edge. all vertices have initial voltage $V_i$ and all edges have initial current $I_{ij}$. Now, is there a general way to ...
ZhenRanZR's user avatar
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Which magnetic field is the one in the inductance equation?

Any self induction problem that can be solved via $emf=-N\frac{\Delta \phi}{\Delta t}$ should be equivalently solvable via $-L\frac{\Delta i}{\Delta t}$. What if the coil is already existing in a ...
Jack's user avatar
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Voltage measured by a Volt meter on a coil

This question is asked on the 2002 Canadian Association of Physicists Prize Exam: By all logic, the voltage across an inductor in a circuit should be the same as the induced EMF. Or, if there is also ...
Fluidized Pigeon Reactor's user avatar
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Voltage drop across an ideal inductor

I was afraid to type the title of the question though there are lot of answers to similar questions. I spent half a day going reading these questions and trying to understand the answers posted and ...
Vinay5101's user avatar
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Inductors with different directions connected in series

I know that inductors oppose the change of the current. So for two inductors with different direction in series (one in clockwise and the other in counterclockwise), the equivalent inductor is $L_{eq} ...
Jarry's user avatar
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Disagreement between theoretical and experimental inductance of a coil

I have a coil of 20 AWG enameled copper magnet wire with approximately 270 turns: 9 layers of 30 turns. The coil is tightly packed with an overall height of about 30 mm, an overall outer diameter of ...
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Current equation for a circuit containing 5 basic elements in series

Does a general equation (for current) exist for a circuit containing the five elements namely e(dc), e(ac), R, L (active/inactive), C (charged/uncharged) in series? If yes, can i derive from it the ...
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Current sensitivity in transformer scheme with SQUID

I've tried to determine the maximum current sensitivity in this transformer scheme but I'm not sure if my solution is valid. I need to find the relation between the current in the input transformer ...
Anton Gunnarsson's user avatar
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Can an inductor increase circuit current?

Suppose there is a simple circuit with a resistor, battery and inductor. The question that came to me is, by opening the circuit breaker, can the inductor be used to oppose and slow down the circuit ...
Parsa Yasini's user avatar
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Back EMF in electromagnetic coil

I am trying to quantify the back EMF generated while actuating an electromagnetic coil, this would be included in a general calculation to estimate the coil output under a variety of conditions. My ...
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Energy relationship of capacitor and inductor in $RLC$ circuit

Suppose I have an $RLC$ circuit , consisting of a capacitor of capacity $C $, an inductor $L$ with non-zero internal resistance $r > 1$ ohm and a resistance $R$. The following Claim: When the ...
Adam Boussif's user avatar
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What will happen in series $LC$ combination with DC source if there is no resistance?

Can a inductor and capacitor series combination control current in a resistance-less wire, connected with finite dc voltage battery, from reaching infinity? Why it should In the intial stage at $t=0$ ...
SHINU_MADE's user avatar
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Equation relating the current carried by a solenoid to the force experienced by a magnetic dipole?

I am trying to find an equation or a series of equations that relates the current I carried by a solenoid of length L with turns N to the force F experienced by a magnetic dipole of strength M that ...
cyalatergator's user avatar
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Fundamental physical concept behind inductance of a long wire above a ground plane

Please explain the underlying physics concept behind the inductance of a long wire above an infinite ideal ground plane. Sometimes the image method is used and sometimes the coupled magnetic flux ...
Marcel van Doorn's user avatar
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Thought experiment: EM fields and coils

Hello Physics Exchange, I have been thinking a lot lately about EM fields. I thought about something the other day and wanted to check with the experts if my intuition is correct or not. I know this ...
Coffee Inlet's user avatar
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Maximum Impedance for LCR series circuit

Impedance of an LCR series circuit can be maximum when either Inductive Reactance or Capacitive Reactance is maximum at an instant of time. Max Capacitive Reactance is at minimum frequency, and max ...
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Which of these is the right way to interpret finding the current across a coil

If we have a coil which has a resistance of 100 ohms an induced emf of say 20V and this is connected to an AC power source of 100V and is in a series connection with another resistor of lets say 50 ...
hoff's user avatar
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Self-induction in a permanent magnet

when a permanent magnet is moved in a coil, an emf is induced in the coil. so is an emf also induced in the magnet itself? and if not then why not. and if I replace this permanent magnet with a ...
Safa yousif's user avatar
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Why doesn't current flow stop in LC oscillation?

Why doesn't current flow stop in a LC circuit? It is supposed to stop when the magnitude of emf developed across capacitor is the same as the inductor, right?
Krishnaprasad R's user avatar
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What logic is being used in Bleaney & Bleaney to prove the reciprocity theorem for mutual inductance?

I'm currently reading Bleaney & Bleaney 3rd Ed. On pg 136 they discuss the case of 2 coils. Their logic is as follows: If a second coil is brought near to a coil carrying a current $I_1$, there ...
psychgiraffe's user avatar
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What does "90 degrees ahead of phase" mean in inductance problems?

I've been working on this homework problem and I have determined that the induced EMF on the right coil is sin(x-90). However, I do not understand what "ahead of phase means." When I graph ...
ral's user avatar
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Coilgun projectile force calculation

Please excuse me if I am completely wrong because I am a 9th grader but I hopefully am able to explain briefly about my problem. I was trying to create a function to calculate the Force of an iron ...
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Are there losses in an ideal transformer?

In a circuit with an AV power source $V$ and a zero-resistance ideal coil, the power from the source. $P_{in} = IV$ is equal to the rate of change in the magnetic energy $U_B$ stored in the coil. The ...
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Which properties of a metal can be measured via an Inductor in an $RLC$ circuit?

I am trying to understand the properties of metals by using them as cores for an inductor in an $RLC$ circuit. Now the resistivity, saturation point, magnetic permeability electric permittivity all ...
User's user avatar
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Is AC voltage across transformer pi shifted?

Suppose the voltage in the primary coil in a capacitor be Vprimary = Vosin(wt) According to my understanding, as the (AC) current in the circuit increases, the Magnetic flux across the secondary ...
Maddy's user avatar
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Telegraphers' equations for lossy transmission line when $R$, $L$, $G$, and $C$ are frequency dependent

The telegraphers' equations are commonly written as $$\frac{{\partial v(z,t)}}{{\partial z}} + R\space i(z,t) + L\frac{{\partial i(z,t)}}{{\partial t}} = 0$$ $$\frac{{\partial i(z,t)}}{{\partial z}} + ...
Andy Ackland's user avatar
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Determining the condcutivity of a material by method of contactless resistance caused by putting a sample rod in the inductor of an RLC circuit

I'm doing an experiment where I'm trying to determine the conductivity of a material by putting a sample rod in the center of a coil which is a part of an RLC circuit with an AC generator. I was told ...
Shxoenjci's user avatar
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210 views

Current and Magnetic Poles of a Solenoid (Diagram) & Right Hand Thumb Rule

Well, my doubt's pretty elementary. Firstly I wanted to confirm whether both the cases, as illustrated in the picture, are correct. I've darkened the part of each coil that faces us. Using the clock-...
entropy's user avatar
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How different is the induced magnetic field of a coil with a solid rod core and a sheet-wrapped one? (Assuming both use the same material)

I'm doing research for a university project and looking for commercial references for Mu metal, I found out that in my country at P2B (particular to business) level, sheets are significantly easier to ...
murisio's user avatar
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415 views

Why is the flux not zero here (Faraday's law)?

I've recently been reading the Griffiths Electrodynamics book, and came across this problem (7.17, 4th edition) and its solution: I don't have any objections for the solution to part a). I have, ...
davidaddisonsenjaya's user avatar
2 votes
1 answer
67 views

Does parasitic capacitance contribute to the magnetic flux?

When modeling a real inductor, typically the equivalent circuit is the following one: Source A series resistance and parallel capacitor is added. This model works very well to explain the following ...
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Does the temperature of a transformer affect the relationship between the induced voltage and primary current?

I'm doing an experiment involving inductance between two coaxial solenoids of the same length where I measure the rms value of the alternating current through the outer solenoid and rms value of the ...
Bob's user avatar
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2 votes
5 answers
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Magnetic field in a capacitor in a $LC$ circuit

Consider a simple $LC$ circuit in which the charge on the capacitor varies sinusoidally. Current flows in this circuit, changing the charge on the capacitor and hence changing the electric field ...
Aspirant29's user avatar
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Why actually at resonance the inductive and capacitive reactance cancel each other?

I am learning about series LC circuit that is in resonance. It says it is when the impedance offered is minimum due to the angular frequency being at a particular value(1/√LC).People say that they are ...
Dhyaneshwar's user avatar
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Why current does not instantly reach maximum value in an $LR$ circuit?

In an $LR$ circuit, I read that when an resistor $R$ and an Inductor $L$ are connected to an emf $E$ source in series, and the switch is switched on, the current flowing in the circuit does not ...
Aditya Mukherjee's user avatar
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How to find magnetic permeability of a mixed core?

Inserting a ferromagnetic rod into the core of an inductor increases its inductance. If the change in inductance is known, the following equation can be used (or so I assume) to find the relative ...
Varya Kern's user avatar
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Calculation of self-inductance of an arbitrary shape

I have been taught two methods for doing this however I do not understand one of them completely. I will try to explain what I don't understand with a few examples. Irodov 3.319: A long coaxial cable ...
Harshul's user avatar
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4 answers
150 views

Confused about sign of mutually induced EMF when applying KVL

Suppose I have several circuits with inductors like so: and I want to find the current $ i_1, i_2, i_3 $ in each circuit. I will use Faraday's law to find the induced EMF and then use Kirchhoff's ...
Jason's user avatar
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How to calculate impedance in a wire moving through a magnetic field?

I'm trying to build a homemade rail accelerator. I understand that the force on a wire is proportional to the cross product of the magnetic field vector and the current vector. I asked my professor ...
Joseph Summerhays's user avatar
1 vote
3 answers
444 views

Does the unit "volt-seconds" have any interesting interpretation?

I was contemplating the units of capacitance and inductance in electrical circuit theory and noticed something that bugs me. Although there are many equivalent ways to write the farad (seconds per ohm,...
Adam Haun's user avatar
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Reactance of an Inductor

The following video here derives an equation for the reactance of a capacitor. I am trying to derive the equation for reactance of an inductor. Given an AC voltage drop $V(t)=V_osin (\omega t)$ in ...
William Garske's user avatar
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1 answer
225 views

If two inductors with different inductances are connected in parallel to a dc circuit, will they have the same current in them at steady state?

Can the current division rule be applied to the inductors in steady state ? Wouldn't they have the same current in them if they are ideal ?
wonderingwhy's user avatar
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Help With Complex Numbers in Polar Form in the Context of AC Voltages

I'm learning about AC right now, and I think I've got an OK grasp of complex numbers (not in their polar form, though), but I don't understand this step in a derivation at all: $$V_i=V_0e^{j\omega t}$$...
JBatswani's user avatar
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1 answer
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Mathematical expression for self-inductance constant $L$?

Is there a mathematical expression for what the value of $L$ (self-inductance constant) is for a given geometry? I've tried to come up with something, but I don't know if it's right or not... $$\phi_B=...
JBatswani's user avatar
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If we change the direction of the connections in a step-down transformer, will it become a step-up transformer?

If we change the direction of the connections in a step-down transformer, will it become a step-up transformer?
Akshat Parmar's user avatar
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2 answers
235 views

What is the angular frequency $\omega$ in which the maximum current occur?

for a circuit which consist of an AC supply, an inductor, a resistor and a capacitor, the differential equation would be $IR+V_C-V_0 cos(\omega t)=-l\frac{dI}{dt}$. Taking another derivative with ...
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How is potential difference created in an inductor [duplicate]

As far as I know potential difference can only be created by electric field created by static charges, but in case of inductor non-conservative electric field is induced.
Anurag jaiswal's user avatar
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How do non-ideal inductors behave in a circuit?

I cannot comprehend how can we break a seemingly non-ideal choke coil into just a pure resistor and inductor in series according to the following solution of a question. Considering the data in the ...
Blz's user avatar
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1 answer
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How can Current Flow through the Inductor in the AC Circuit? [duplicate]

It's said that if the inductor is connected to the alternating voltage source, alternating current will be created in the circuit. Changing magnetic flux through the inductor will induce a voltage as ...
Dario Mirić's user avatar

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