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Questions tagged [electromagnetic-induction]

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56 views

What is the QM equivalent of induction?

And regarding electron correlations, reciprocally what QM ones are strictly due to classical induction and near field effects? Edit: thanks to whoever thinks necessary to downvote questions without ...
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Electrostatic induction with a zinc plate

As you can see in the images, in the first one I am using a plastic rod rubbed with my hair to attract the pieces of paper using induction. In the second one, I am using a pure zinc plate(extracted ...
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Can we generate electricity by using rotation of wheel of a bicycle? [closed]

Can we generate electricity by using rotation of wheel of a bicycle ?
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Electromagnet, why does not coil and metal repel each other

In an electromagnet, if the electric coil induces a magnetic field in the metal bar with the same polarity as the one in the coil, should not the bar and coil repel one another, "like poles repel"?
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Variation of Induced EMF in a cross bar of a ferris wheel

The question is as follows. A ferris wheel which consists of two parallel large wooden wheels is joined together with metal cross bars as shown in the figure,is erected so that the planes of wheels ...
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current induced on an inductor modifying inducing magnetic field. Wouldn't that cause an infinite oscillating feedback?

Imagine a simple circuit with an inductor and resistor in series. Now pass thru a varying flux thru the inductor, a phi. The vary flux induces voltage on the ...
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Effects of opposing fields in coupled inductor

This is a duplicate question that I already made in the electrical engineering part of stack exchange. As I`m asking for the physics behind the effect I thought it might be worth to ask also here. ...
31 views

Magnetic flux density compard to other definition of flux

With regards to flux i have always assumed it was defined as $$(1) Something/m^2s$$ For instance $Luminosity/(4\pi r^2)$ Is an example of radiation flux. Why then is faradys law often cited as the ...
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How does an alternator produce AC?

As an alternator’s coil moves, one side of the coil induces a voltage and thus a charge flow in one direction However, simultaneously the other side of the coil induces a voltage and charge flow in ...
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Does the state of curl of the $E$-Field at a point adjust itself instantaneously as soon as $B$ begins changing at a fixed rate, or is there delay? [duplicate]

Faraday’s Law () states that a time-changing magnetic field vector induces a curl of the Electric field around that point. However it does not specify how quickly the necessary spatial gradient is ...
153 views

How can EM waves propagate indefinitely when they really are oscillations of electric and magnetic fields?

I can't claim that I've fully grasped the science behind EM waves, but as far as I understand, EM wave is basically oscillations of electric and magnetic fields kinda switching back'n'forth and ...
234 views

Relationship between self induced EMF, inductance and current's rate of change

I'm kind of confused about the principles of self induction; Does change in current represent the change in the net current (battery's current + induced current) or just battery's current? among the ...
80 views

Can $F=qvB$ be applied to a solenoid and a parallel moving magnet?

If you take a scenario like this, Charge gathers at either end, and if you could somehow form a complete circuit without there being a canceling effect, there would be a current flowing. This makes ...
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Simple explanation to the induction from the slowly changing $\vec B$ of a solenoid in the region of $0$ magnetic field

I would like to get some elementary intuition into the problem a solenoid fed with a time-dependent current, and the resulting current that such the solenoid field would induce in a loop completely ...
49 views

Induced current due to induced current

Say we have a square coil and a change in magnetic flux is created through the coil. Thus inducing a current in the coil whose magnetic field opposes this change inside the coil. If we assume(for ...
56 views

Order of Magnitude for Photon Induction

What does magnetic induction look like when we imagine just one photon passing by? I'm imagining some sort of coil wrapped around the edge of a waveguide or something so that it picks up some of the ...
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How to induce large current in a flexible wire

I have not tested this method in the lab or anything, but based on what I know about electrodynamics I would say the following set up could work: I would take two straight flexible free-of-current ...
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Two types of electric field

My textbook mentions that electric field produced by electric charge and that produced by changing magnetic field are different in nature. After searching from various sources I found that electric ...
635 views

Why is there no current induced when the coil is vertical in an AC generator?

In this picture, the movement of the coil inside an AC generator is shown. My question is when the angle is zero or like in the beginning, the coil is vertical to the magnetic field yet no emf is ...
38 views

Secondary current in a loosely coupled transformer

How does the secondary current depend on the resistive load placed on the secondary winding of a loosely coupled transformer, in which the primary winding is supplied with a linear current ramp ?