# 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.

1,767 questions
Filter by
Sorted by
Tagged with
15 views

### 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 ...
292 views

### Potential due to initially uncharged induced conductor?

From Griffiths' Introduction to electrodynamics: In this problem, Griffiths says that we will set the potential inside and on the surface of the conductor to be zero since its an equipotential ...
2k views

### 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 ...
27 views

### 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 ...
44 views

### 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 ...
1 vote
226 views

### Energy Transformations in a Motor

I'm confused about how the energy transformations in a motor work. I'm not comprehending how the electrical potential energy within the circuit is transformed to rotational kinetic energy of the coil, ...
21 views

### 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 ...
528 views

### Is there a Halbach array equivalent for a coil?

Is there is a way that a coil can have one side of strong alternating field and the other side a weak alternating field? I was planning to use this and see if the efficiency of a coupled coil can ...
9 views

### 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 ...
1 vote
23 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 $|\vec{B}|=g$. ...
949 views

### How eddy currents effect the impedance of source?

When we connect a bigger resistance to a transformer, the current decreases both in the primary and secondary. To be able to maintain the same current, we'd have to increase the voltage. Now imagine ...
614 views

### Finding induced magnetic field strength given current.

I'm working on a project involving a Tesla Coil, and I was hoping to figure out how strong an induced magnetic field would be with an input voltage of X. Is there an equation to help solve this? I'm ...
29 views

### 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 ...
40k views

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 ...
42 views

### 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, ...
556 views

### Location of high and low potential points in motional emf

Okay so in the above image the semi circular loop is rotated and a sector of it is introduced into the magnetic field. Questions: I know the magnetic field is constant so no non conservative ...