Questions tagged [electromagnetic-induction]

This tag is for questions regarding to electromagnetic induction, a process in which a conductor is put in a particular position and magnetic field keeps varying or magnetic field is stationary and a conductor is moving. Electromagnetic Induction was first discovered way back in the 1830’s by Michael Faraday.

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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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Wrapping a Voltmeter Around a Solenoid

I just read this really interesting paper by Robert H. Romer and it has me curious: what would happen if you wrapped the positive lead of a voltmeter once around a solenoid with a linearly increasing ...
Dominic Stewart-Guido's user avatar
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Why is the Voltage across the coil the difference between the induced emf and the total voltage [closed]

I understand all of this question except for the very end.Its from a test I was looking at from a couple of years ago. A coil consists of 150 turns of wire and has a total resistance of 200 Ohm. It is ...
hoff's user avatar
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Application of Faraday’s law of EMI [closed]

I’m a high school student. In this question the magnetic field is confined to a cylindrical region. I’m assuming that the answer will be same if the magnetic field was not confined. Is my assumption ...
KPS's user avatar
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9 votes
3 answers
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How does a wireless charger work if there is no transfer of electrons?

I have read this: the definition of electrical current is the flow of charge. Now, it is also possible to transfer energy (and therefore power) through either free space or a conductor by ...
Árpád Szendrei'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
1 vote
0 answers
24 views

Dirac strings are classically observable through induction?

For my Masterthesis I will have to dive a bit into Dirac monopoles, which are said to be pairwise connected by a Dirac string which is just an infinitesimal fiber carrying magnetic flux $|\vec{B}|=g$. ...
Andres Huster's user avatar
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is my folowing understanding about why induced curent is produced due to a change in magnetic field correct? [closed]

Relativistic Origin of Magnetic Field: the magnetic field is a consequence of relativistic effects acting on the electric field. This implies that changes in the magnetic field will correspond to ...
uchiha med amine'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
1 vote
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9 views

Induced current density and magnetic field arising from forced oscillations of particles in a constant magnetic field?

I am being confused by what should be a simple physical scenario. Let's say I have a small, cylindrical region of radius and height are both $a$ filled with a medium of both positive and negative ...
Devang Naik's user avatar
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2 answers
51 views

Can a finite displacement current density have an associated displacement current of zero?

For an Electric field defined in such a way that $(i)$ it is tangential at every point along a circular path of area $A$, and $(ii)$ has a finite $\frac{\partial E}{\partial t}$ value. Basically it'...
SHINU_MADE's user avatar
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No displacement current should be produced in this case, but it does!

Considering this question, i think the concept used is wrong coz direction of E produced due to changing magnetic field is along the circular loop(tangential at each point on loop) of radius r. While ...
SHINU_MADE's user avatar
2 votes
2 answers
179 views

Is the current induced in coil in Faraday's experiment displacement current?

In Faraday's experiment- Only if we have a imaginary coil rather than a real coil, then change of magnetic flux through that imaginary coil and electric field induced in the imaginary coil/region ...
SHINU_MADE's user avatar
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1 answer
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Induced Electric field due to magnetic field in Faraday experiment

Regarding this experiment where a magnet is moved in and out of a coil -(see the picture) what i considered to be true is that when there is a changing magnetic flux through the coil(due to changing ...
SHINU_MADE's user avatar
6 votes
4 answers
705 views

How do Electric and magnetic fields generate each other (mathematically)?

Regarding electromagnetism, a changing magnetic flux$(\phi_B)$ produces emf by-$$EMF= -\frac{d \phi_B}{dt}\tag1$$ This emf creates a current which again creates a magnetic field given by-(bio-savart ...
SHINU_MADE's user avatar
0 votes
3 answers
65 views

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 ...
Rd Basha's user avatar
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I can’t figure out the magnetic field around a non-straight wire

Say I have a circuit where the wire has a shape defined by some closed Parametric defined as $(X(t), Y(t), Z(t))$ (it is a loop), how do I calculate the entire magnetic field around the circuit?
GIORGI GOGIBERIDZE's user avatar
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2 answers
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Magnetization current when two magnets are brought together and the Lorentz force law

Suppose we have two ferromagnetic objects constituting two permanent magnets. A classical way to think of the two magnets repelling/attracting each other would be by ascribing bulk and surface ...
Maximal Ideal's user avatar
1 vote
2 answers
81 views

Did my pot really reach >400°C internally while heating water (soup broth)

I have a 1800W induction cooktop. In my experiment, did the following steps: I placed a stainless pot on the cooktop, half filled with fridge cold chicken broth. I heated the pot at 1000W until I ...
Francois's user avatar
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Will a charged body generate current in this situation?

Suppose we charge a body with negative charge. We then place it inside a Faraday shield that has openings in the form of vertical slits. A coil surrounds the shield. If we start rotating the Faraday ...
Artur Zagraienko'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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2 answers
33 views

Inducing electric field vs Inducing magnetic field

Is it easier to induce an electric field using a changing magnetic field or the other way around? The question is from my high school booklet, and I am pretty sure it was to be answered on an ...
orionbuff_62's user avatar
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Eletrostatic induction

I know that when we are dealing with a charge inside a, initially neutral, spherical conductor, the outside induced charge will rearrange uniformly. But, let's say now we have two conductive planes, ...
meu estudo's user avatar
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Using the magnetic masses model how do i find the induced magnetic field due to a magnetic point charge?

I am deriving an equation modelling a magnetic guitar pickup and I am stuck. I am trying to derive based on a paper for guitar pickups and it uses a magnetic masses method to find the magnetic flux at ...
KL Web Design's user avatar
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1 answer
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Is it possible to build electrical space engine based on Electromagnetic induction

Electromagnetic induction means magnet convert it momentum to an electrical current. So I wonder if it possible to use this phenomeno for making an enigne which will accelerate a magnet And the ...
daniel's user avatar
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Superconductor Cube levitating in Vertical magnetic field

Suppose there's a Magnetic field in vertical direction and we hold and release a superconductor cube so experimentally it is seen that the cube floats/hovers in the same orientation as it was released ...
Macron's user avatar
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1 vote
1 answer
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Application of Faraday's law to a wire inside a coaxial cylinder with alternating current

I'm having some trouble solving an electrodynamics problem. There is a wire inside a coaxial cylindrical conductor of radius $a$. An alternating current $I=I_0 cos(\omega t)$ flows in the wire and ...
Fede's user avatar
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0 answers
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How does plate thickness affect magnetic levitation?

I’ve been watching videos: Like this about magnetic levitation. They have a copper plate, normally quite thick, a smaller disk magnet under, and a larger disk magnet on top. Upon movement of the ...
SpiralingTessaract8164's user avatar
1 vote
1 answer
106 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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0 answers
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Levitation of a Lightbulb with Electromagnetic Induction

I recently purchased a ''levitating lightbulb'' device where a lightbulb is made to float above a base via magnetism, but I am not sure exactly what is going on. This device is not a Levitron, which ...
Tom'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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0 answers
26 views

Does the Change in Area Not Affect EMF Calculation in a Time-Varying Magnetic Field?

I had this Question as a Homework : Given a conducting frame of width $𝐿$. A mobile conductor is mounted on the knitting needle that moves on the closing one at speed $\vec{𝒗} = 𝑣\hat{x}$ while ...
Losh_EE's user avatar
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2 answers
393 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
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1 answer
42 views

Does the current increase in a wire if a surplus amount of electrons is added to the wire?

Assume that an LED is placed in a closed-loop of wire (ring) being located on the table. A bar magnet located a specific distance away from the table/ring is released to fall under the influence of ...
Mohammad Javanshiry's user avatar
2 votes
2 answers
77 views

Would seawater flow be affected by a magnet?

Let's suppose that there are two streams of sea water, flowing on a flat inclined surface. Both of the streams are distant, independent of each other and parallel to each other. Now lets image I put a ...
Dario Deniz Ergün's user avatar
1 vote
1 answer
45 views

How to calculate the torque produced by a spool rotating in a uniform magnetic field?

Assume a setup where you know the radius $R$ of a conductive loop that has $N$ windings, which is rotating at a frequency of $\omega$. Suppose you also know its length and resistance. Then, you could ...
DAIQRY's user avatar
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0 answers
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Are the phases of the induced current (eddy currents) in a thin sheet uniform?

I have implemented a 2D finite difference method to compute the eddy currents induced by an AC magnetic field (homogeneous, oscillating at a fixed frequency) in a conductive thin sheet. Typically, the ...
tarta's user avatar
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0 votes
3 answers
74 views

Why does current increase in step-down transformer?

I'm trying to make sense of transformers. $\varepsilon_{p} = $ emf in primary coil, $\varepsilon_{s} = $ induced emf in secondary coil, $N_{p} = $ number of turns in primary coil, $N_{s} = $ number of ...
Роман Кирьянов's user avatar
1 vote
0 answers
25 views

Which equation is most valid for finding power dissipation in a induced magnetic pendulum system?

Considering a set up where a conducting pendulum oscillates between two permanent magnets, I want to somehow calculate the power dissipated by the magnetic braking force the magnets provide, in order ...
Student.Coder's user avatar
-1 votes
1 answer
96 views

Is Faraday's Law a conditional statement?

Faraday's Law is of course: $$\mathcal{E} = -\frac{d\Phi}{dt}$$ My contention is that the law should be written this way: $$-\frac{d\Phi}{dt} \Rightarrow \mathcal{E}$$ In other words Faraday's law ...
Ryan's user avatar
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0 votes
2 answers
107 views

Definition of voltage for motional EMF

In the schoolbook physics example of a generator, the wire loop rotating in a constant (both in space and time) magnetic field, we can measure a non-zero voltage between the loop's two terminals due ...
Damian Birchler's user avatar
2 votes
5 answers
104 views

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
0 votes
1 answer
79 views

Lorentz force separation from induction in rotating loop within AC magnetic field

I was wondering , is it possible to create a loop of any kind of geometry that could rotate in a non homogeneous AC magnetic field and have no net induction within the loop but only have current ...
Girts's user avatar
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1 answer
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What is the direction of the induced emf in this situation?

I know there have been plenty of variations of this asked before, but all of them I have seen don't really answer the question, or at least in a way that 'clicks' with me. In terms of how i already ...
mysterious_lambda's user avatar
0 votes
2 answers
97 views

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
1 vote
0 answers
11 views

Is there any way to detect localized magnetic field change in a magnetic material or powdered magnetic material?

Hi I was wondering if there was any way to detect localized magnetic field change within either bulk magnetic material or within like powdered magnetic material. The application we are looking for is ...
assasinchop7's user avatar
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0 answers
33 views

Faradays Law for a non conducting loop

If we consider a non conducting loop moving with a velocity entering a magnetic field, I think it won't be able to induce motional EMF as physically no charge separation is possible in an insulator to ...
Aspirant29's user avatar
4 votes
2 answers
125 views

Faraday's law and a moving charge

Suppose we have a moving point charge with respect to some conductor which has a shape of a closed loop (e.g. a loop of wire). From the conductor's point of view the moving charge has a magnetic field ...
Krum Kutsarov's user avatar
1 vote
1 answer
62 views

How do protons transfer from one object to another by induction?

Charging by induction begins with a positively charged object and a neutral object which causes the electrons on the neutral object to be closer to the charged object. In diagrams I saw online, when ...
aud's user avatar
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0 answers
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Lenz' law in magnetohydrodynamics

I was wondering, is the Lorentz force tendency to oppose fluid motions just a manifestation of Lenz' law? Especially in dynamo problems where fluid motions induce the magnetic field.
BitterDecoction's user avatar

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