# Questions tagged [electromagnetic-induction]

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### Torque on a rotating sphere in a uniform magnetic field

Consider a uniform magnetic field. We know that if we have a conductive loop rotating in this magnetic field then we get a current running through that loop due to Faraday's Law, which in turn exerts ...
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### What does EMF actually mean?

After studying EMF in DC circuits I realised that EMF is just the potential difference between cell terminals in an open circuit. But then I was introduced to Faraday's laws of electromagnetic ...
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### The current in an inductor, the voltage across it, faraday and lenz's law

Let's say there is an ideal AC voltage source connected to an ideal inductor. The applied voltage is a sine wave. And the current must also be a sine wave(albeit only for an instant) Deriving from ...
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### Induced electric current in a rotating circui [closed]

How can we derive a formula for the instantaneous e.m.f. ?
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### Motion of a current carrying conductor

When a current carrying conductor is placed inside magnetic field, what motion does it take? Does the motion not occur and only Hall emf is obtained. Or if there is a motion due to Lorentz Force, ...
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### Inducing electricity

I'm trying to under stand electromagnetic induction more and have been looking up all the ways to induce a coil with a magnet and keep only finding these three types of examples. I’m confused as to ...
301 views

### Induced EMF vs battery EMF

I am bit confused at whether induced emf and battery emf are same in nature differing just in their source. Does a potential gradient exist in case of induced emf as we have when a battery is ...
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### Amateur student making a demo of electromagnetic induction via copper coil and magnet

I'm trying to observe electromagnetic induction by creating a copper coil solded to a diode led and waving an alnico magnet inside the copper coil's core. You can see my amateur setting below (...
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### AC generator and the induced current

Why does increasing the area of a coil in an AC generator increases the induced current? Has it something to do with the force between different arms of the coil that is each exert a force on the ...
23 views

### Why a Pan on induction heater not feel a repulsion force like a eddy current separator?

Eddy current separators are used to separate conductive and nonconductive particles where conductive particles feel a force and thrown away when they reach closer to a magnet. Why a conductive pan not ...
81 views

### Inductor with no resistance

Lets think about inductor that has no resistance. In initial condition, current is $I$, and the mag field is created only by inductor's current. And suppose that there is no battery connected. Now ...
36 views

### Ocean warming by induced electric current for wandering magnetic poles?

In a post on the co-rotation of Earth and its magnetic field (Does the geomagnetic field rotate?), John Rennie raised the point that, if Earth's magnetic field were rotating about its dipole axis, it ...
183 views

### How does a time varying magnetic field confined in a cylindrical region produces induced electric field even outside the cylindrical region?

We know from Faraday's Law of Electromagnetic Induction that due to Time Varying Magnetic Field (TVMF), a non conservative electric field will be induced. Now if we consider a cylindrical region in ...
23 views

### Velocity of strong magnet falling through pipe

What is the relationship between the radius of a non-magnetic tube/pipe and the terminal velocity of a magnet falling through it? I would appreciate if you can provide an equation.
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### Why current flows in an inductor?

If during self-induction the inductor produces a current in opposite direction of that of battery in order to resist the change of current through it then how could the current after some reasonable ...
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### Inductor in a DC circuit [closed]

I found this question, I don't understand how could the current through 2R ,immediately after opening the circuit, be less than when the circuit is closed! Shouldn't be an emf from the inductor that ...