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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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}} + ...
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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 ...
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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-...
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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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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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,...
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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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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: $$V_i=V_0e^{j\omega t}$$...
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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=...
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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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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.
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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 ...
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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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Calculation of equivalent parameters of a few RL links for direct current circuit [closed]

Is there a way to calculate equivalent parameters of a few RL links for direct current circuit (like on the generalized example on the image below)? So far I've studied that known formulas for series/...
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Why are partial derivatives of Energy and Co-Energy with respect to x opposite numbers?

In a system where the flux linkage $\lambda = \lambda(x, i)$ is a function of dispalcement $x$ and current $i$. Its energy is defined as $$ W = \int_{0}^{\lambda} i(\lambda', x)d\lambda'. $$ Its co-...
zifan ying's user avatar
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2 answers
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Intuition behind self-inductance

I'm having a little bit of a hard time understanding some concepts to do with self-inductance in class. I understand mutual inductance. That's when a loop has some time-dependent current going through ...
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$LC$ Circuit: differential equation [closed]

A capacitance of 200nF can, for example, stand for an overhead line with no load at the end. It lies in what we call idle time. The voltage source and the inductance can represent a net behind. It ...
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Dipole formation in electrostatic induction

Let's bring a positively charged rod near a conductor. Now since some electrons in outer shells are not strongly bound to atoms,they will get to the side near the rod. But why does it mean that dipole ...
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Is it possible to find $i’(0)$ and $i(0)$ by building and measuring say voltage across the $RLC$ circuit?

The RLC circuit equation is, $$L\frac{\mathrm{d}^2i}{\mathrm{d}t^2}+R\frac{\mathrm{d}i}{\mathrm{d}t}+\frac{1}{C}i=0.$$ I want to know if it is possible to figure out $i’(0)$ and $i(0)$ through the ...
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2 answers
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Inductance of air core inductor with and without load

I have an air core inductor whose inductance , as measured with LCR meter, is 45.1uH and quality factor is 4.4. When i place an Aluminum alloy (which is a Non-magnetic Material) as Load inside the ...
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Forbidden capacitance in LC circuit connected to AC source [closed]

While solving problems on AC circuits, I came across one that had a circuit connection as shown below. The question was to find the value of "the capacitance that can never be used in this ...
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Why In the following $RL$ circuit, the connection to $b$ must actually be made an instant before the connection to $a$ Is broken? [duplicate]

In Resnick halliday, student 10th edition page - 795. In the topic current decay in RL circuit, the following statement is used, the connection to b must actually be made an instant before the ...
You know who's user avatar
2 votes
1 answer
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How self-inductance is possible in a Solenoid?

In a solenoid, when current changes with time an EMF is induced, but it should not be like this, because the wire which is bend to make solenoid is isolated (usually painted to give it an insulation) ...
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How exactly does an inductor behave in a circuit after reaching its steady state?

I was solving this question in my coursebook and was not able to understand it conceptually. Though I did understand the mathematical approach to it. Now I understand that when the rod is given an ...
Astrophile's user avatar
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1 answer
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Solenoid inductance with ferromagnetic core dependence on coil distribution

If I have a long thin solenoid with an iron core, to lowest order, does the distribution of coils along the length of the core matter in calculating the inductance? As an example: Say I have a 30cm ...
Robert Smith's user avatar
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Inductance in gapped core vs a long solenoid

The inductance for a long solenoid with a ferromagnetic core is easily calculated. $$L = \mu N^2\frac{A}{L_{core}}$$ For a toroid, it is similar, but the length is the circumference of the toroid. $$L ...
Robert Smith's user avatar
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Variation of Permeability with DC magnetising Field

For any Powder core, as DC magnetising field increases, the initial permeability decreases known as "permeability roll off". For example for an MPP core- For MPP cores the initial ...
Frost ghost's user avatar
3 votes
1 answer
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What is the electric field around an inductor?

This question comes from this Walter Lewin video at 35:00 where he says "I'm going to confuse you even more" (and I suppose he somewhat succeeded). Walter Lewin claims there is an electric ...
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Defining magnetic flux in rotating cylinder

Suppose We have a charged rotating cylinder such that the magnetic field inside it is the same as a solenoid of the exact same dimensions. Obviously, the current per-unit length for both will be the ...
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