# 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?
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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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### 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?
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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 ...
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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-...
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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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### 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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1 vote
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...