# Questions tagged [electromagnetic-induction]

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### Why does change in magentic flux decrease as turns increase?

Let us consider the primary coil of a transformer. As we apply a constant voltage (say 240V) over the primary coil, and vary the number of coil turns we should expect to see the below relation (...
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### Can Induced current be obtained by only changing the direction of the Magnetic Field?

According to Faraday, a change in magnetic flux induces current in a conductor. Just suppose we take a circular coil, and pass a magnetic field inside it, and keeping changing the direction of ...
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### How does the atomic magnetic moment get locked with external magnetic field?

When an atom has a net magnetic moment that is not aligned with external magnetic field, it is said that the atom rotates because of the torque and the magnetic moment gets aligned with external field....
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### How to calculate the limits for volume and mass for induction heating samples?

I'm evaluating the feasibility of using volumetric induction heating to quickly heat up steel molds. One thing I have come across is that induction heating really only works for surface heating or for ...
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### Is there is any way to prove the Faraday's law of induction?

I want to know if there is any way to prove the Faraday's law or is it just an experimental observed phenomena? More specifically, is there any reason why the proportionality constant is 1? How did ...
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### Why not change magnetic flux only at the edges?

I learnt Faraday's Law of Induction however I was confused about why the area aspect of magnetic flux impacts on the EMF generated. Why do magnetic field lines inside the coil area affect the EMF ...
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### Is Faraday's induction principle applicable in outer space?

Is it possible for an AC generator to actually generate electricity let's say being in a ship orbiting Mars or on the surface of the moon? Does Faraday's principle require the magnetig field of the ...
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I am trying to understand Faradays law of Induction. As far as I know when we are speaking about the E field we mean the field caused by charges(stationary or moving) whose value we can calculate by ...
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### Why is the emf induced in a closed spiral in a time-changing magnetic field less than that induced in a closed loop of the same radius?

I don't get it. Is the area linked different? Or is it something less? This is the kind of closed spiral I'm thinking of:
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### Electromagnetism— why do we only care about flux inside the loop? In other words, why is the area in 'φ=AB' the area bounded by the loop?

When we calculate the emf induced by placing a loop of wire inside a changing magnetic field, why do we use the area bounded by the loop to calculate total flux and then the rate at which it changes? ...
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### why is $E=4.44fN\phi$ valid for the primary winding of a transformer?

According to the Faraday Law of induction, A variable magnetic field in a region induces an electric field in the same region. I have trouble applying this to the two sides of a transformer. For ...
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### Force by a changing magnetic field on a stationary charge

I already know that a moving charge experiences a force in a constant magnetic field governed by the Lorentz force formula. What I want to know is that whether a changing magnetic field exhibits a ...
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### Faraday's Law and the Law of Inertia

Faraday's Law can be stated qualitatively as : Any loop (of wire) opposes/resists the change of magnetic flux through it. The Law of Inertia states that any physical object resists its change in ...
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### continuous Electromagnetic Induction in two coils

First of all, i am sorry if i overlooked this question although i browsed the list of questions on the topic. I have difficulty understanding that when a changing magnetic flux in a coil induces an ...
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### Equation for induced electromagnetic field

Is the induced electromagnetic field (EMF) always equal to negative rate of change of flux, where $f$ is the flux? I'm curious how it can be true in every case.
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### How is it possible that the two voltmeters in parallel measure these different voltages

I'm currently studying induction law and circuits with inductors. I came however with the following circuit: Now my text says the following: "Unlike what your intuition might tell you, oscilloscopes ...
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### Explain Lenz Law with Conservation of Energy [duplicate]

My question is: If the bar magnet is moved towards a coil connected to a galvanometer and instead of a opposing magnetic pole a attractive pole i.e. south of coil and north of magnet is created due to ...
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### Magnetizing inductance in transformer

I asked this question in electronics stack exchange as well but I thought it would also be applicable here as my question revolves largely around Maxwell's equations. I am learning about transformers ...
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### Electromagnetic Induction with liquid conductor

If a conductor is moved in a magnetic field current is induced in that conductor. So if I use Liquid mercury in place of the conductor will the same happen?
In order for this question to be clear I must first give some context: Consider a 10cm long solenoid (solenoid A) of radius approximately 1cm with 400 turns. Let the current in $A$, $I_A$, ...