8 votes
Accepted

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

Linked differential equations may reinforce one another leading to unbounded exponential growth - but they do not have to. For example, the linked equations $\displaystyle y = \frac {dx}{dt} \\ \...
gandalf61's user avatar
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4 votes

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

From a spatial point of view, it very much looks like a changing electric field generates a changing magnetic field. And vice-versa. But this raises the problem of causality and locality. Its general ...
Mozibur Ullah's user avatar
4 votes

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

This will give rise to induced emf in imaginary coil [...] Yes, induced EMF due to magnet is there, defined for any closed path $\gamma$ as $$ \oint_\gamma \mathbf E\cdot d\mathbf s, $$ whether that ...
Ján Lalinský's user avatar
4 votes

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

It is commonly believed that a changing magnetic field generates a rotation of an electric field. This is not correct. A changing magnetic field and the rotation of an electric field are equivalent ...
my2cts's user avatar
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3 votes

Are there losses in an ideal transformer?

An ideal transformer is by definition lossless. This is why it is called "ideal": the ideal model ignores all the real-life losses that transformers experience. These include resistive ...
niels nielsen's user avatar
2 votes

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

Towards the path of universal conservation of energy in an energetically isolated system, Lenz (1834) formulated his law as a principle avoiding self-amplification of magnetic systems: The fields of ...
Roland F's user avatar
1 vote

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

The unambiguous quantity in this problem is the displacement current density. It has a direction that is defined by the rate of change of electric field. The displacement current is the flux of ...
ProfRob's user avatar
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1 vote
Accepted

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

I don't see any problem in what you are describing. In vacuum the displacement current density, a vector, is always in the direction of the time derivative of $\vec E$. In the circular case here, the ...
freecharly's user avatar
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1 vote

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

In order to have displacement current equal to the real current in a real conductor, the voltage integral along the conductor given by derivative of the area flux wrt. time has to be equal to ...
Roland F's user avatar
1 vote
Accepted

Induced Electric field due to magnetic field in Faraday experiment

To start with question 3), the case where there is no coil but just a magnet that you move through empty space, as @user1245 asked in questionquestions/343447: is there a force opposing the motion? ...
Jos Bergervoet's user avatar
1 vote

Are there losses in an ideal transformer?

For an ideal transformer, the core is assumed to be linear with infinite permeability. As a result, the energy stored in the magnetic core $\int\frac{B^2}{2 \mu}d\tau $ is zero. There is therefore no ...
Vincent Fraticelli's user avatar
1 vote

Are there losses in an ideal transformer?

Let's consider an open secondary, so that you do not have the complication of a current flowing in it. The primary winding is connected to an oscillating voltage source and some sort of limiting ...
Peltio's user avatar
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1 vote

Magnetization current when two magnets are brought together and the Lorentz force law

When the current loops approach each other, they experience a back EMF that acts to decrease the current flowing in each loop. (The source of this back EMF depends on the frame of reference. A purely ...
Brian Bi's user avatar
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