All Questions
Tagged with electromagnetic-induction magnetic-fields
149
questions with no upvoted or accepted answers
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Inductance of two parallel cylindrical wires
Let's say that I've got two wires, one with radius $a$ and the other with radius $b$, $h$ apart, and I want to calculate the self inductance per unit lenght of this system, which is defined as the "...
- 789
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Lab experiment: hysteresis disappears, reappears and then disappears again. How?
In my college laboratory we were assigned an experiment to measure the hysteresis curves of a certain ferromagnetic material at different temperatures. Sounds simple, right? Well, the block of Monel ...
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Induced emf inducing emf in the same body
A time varying magnetic field will produce an induced emf in a closed loop.
This induced emf will in turn produce an electric current which itself will produce a magnetic field.
My questions are:
...
- 1,630
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What happens if I have a square conducting wire being permeated by a magnetic field and the field suddenly disappears?
Suppose there is a square conducting wire in a magnetic field. The two vertical branches will have the same emf, and the two horizontal branches will have 0 emf, resulting in a net emf of zero and ...
- 291
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Explain the infinitude of magnetic flux about a finite length of wire
Ok so it is clear the flux caused by an inductor is limited. If I integrate about a flat spiral inductor I will find that the flux lines going up are a fixed quantity. Since every flux line going up ...
- 658
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Remotely changing superconductor levitation height?
I want to be able to modify the height of a quantum locked superconductor. My original plan was to levitate the superconductor over an electromagnet and modify the current to said magnet (increase the ...
- 111
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Would a $50\: \mathrm{Hz}$ spinning magnetic plate in front of a human generate harmful current?
We know that spinning magnetic plate will generate current inside any wire. so if we stand before 50Hz spinning magnetic plate, then, does that 50Hz spinning magnetic plate in front of us (human body )...
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How change in magnetic field induces emf in conductors?
Some conductors have internal magnetic field that opposes the external field so how does emf will induce in it like copper is dimagnetic but how emf induce in it.
Similarly how emf induces on other ...
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How to find permeability of a magnetic material?
I have been working with magnetic materials for quite some time now and never really explored this fundamental parameter. After looking through the literature I realize there and quite few different ...
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Internally, what defines whether a material is magnetically hard or soft?
I know that magnetically hard materials hold magnetic fields (magnetic moment alignment) for longer, while soft metals do not. However, what, internally, causes these properties to arise?
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Emf induction in a conducting coil placed in a variable magnetic field
Consider a conducting coil placed in a variable magnetic field. By the laws of nature, an emf will be induced in the coil. Between which two points is the emf induced in the coil?
If we consider it to ...
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What is the induced electric field in a moving conducting material in a magnetic field?
I've been taught that the induced EMF in a conductor is the rate of change of flux in it, but Maxwell's equation
$$
\nabla\times\vec{E} = -\dfrac{\partial\vec{B}}{\partial t},
$$
only states so for ...
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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 ...
- 117
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What logic is being used in Bleaney & Bleaney to prove the reciprocity theorem for mutual inductance?
I'm currently reading Bleaney & Bleaney 3rd Ed. On pg 136 they discuss the case of 2 coils. Their logic is as follows:
If a second coil is brought near to a coil carrying a current $I_1$, there ...
- 126
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I can’t figure out the magnetic field around a non-straight wire
Say I have a circuit where the wire has a shape defined by some closed
Parametric defined as $(X(t), Y(t), Z(t))$ (it is a loop), how do I calculate the entire magnetic field around the circuit?
