# Questions tagged [induction]

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350 questions
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### What would happen if i move a rectangle shaped conductor in a magnetic field?

I know that in situation II there will be a induction current; and there will be no induction current because of the constant magnetic flux in situation I; but when we move a linear conductor in a ...
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### Inductors in a.c. circuit problem

As written in my book and as I saw on some videos about inductors that in an ac circuit if an inductor is connected with an a.c. source then the induced emf would be the same voltage as the source ...
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### Faraday's law in open circuits

Faraday's law needs a closed loop $\partial\Sigma$ in order to be applied (so as to be able to calculate the magnetic flux across $\Sigma$). However, $\partial\Sigma$ is just, at least according to my ...
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### Can induced current in a transformers magnetic core be a good thing?

I've read that the magnetic core can be made from resistive (to current) but magnetic materials, and that the iron silicon sheets are laminated to reduce current in one direction. But wouldn't ...
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### Can inductance ever vary with current?

Question is just as above. My thought is that since resistance of a material can vary with current (in a non-Ohmic conducter), is it possible for inductance $L$ in an inductor to vary for different ...
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### Induced Current and Force

I am preparing for an exam in electricity and magnetism, and I came across this problem in my book with a solution that confuses me: A conducting loop of wire is initially around a magnet as shown ...
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### What is 'arcing' at switch contacts in LR circuits when current changes instantaneously?

I am studying from Neil Storey's Electronics book and I can't understand the following paragraph: "We know that the current stabilises at a value of V/R. If the switch is now opened, this would ...
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### Magnetic field generated pointing upwards, what direction is induced current?

In this Crash Course video, from 5:57 to 6:15, I think the directions are mixed up, but I could be wrong. She says that when moving the magnet into the loop, the generated magnetic field is pointing ...
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### Can induction coils heat air?

I understand that induction coils can heat up conductive materials such as metals, but I'm wondering if they can heat up normal air. And if they cannot, can ionizing the air beforehand allow it to be ...
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### Troubleshooting Kelvin's Water Dropper

I am attempting to replicate Lord Kelvin's Water Dropper and cannot seem to get it to generate a voltage. I am not concerned about the spark right now. However, when I fill up the reservoir with ...
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### Which coil configurations transfers the most magnetic flux?

So i'm working on a home project that involves magnetic coupling. I was wondering, of the two configurations described bellow, which one would should allow the secondary coil to receive the most ...
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### The trouble with EMF induced in the coil of wire

For anyone viewing this question who is not familiar with the notion of Induced EMF in the coil of wire let me briefly explain what i understood by it. EMF is induced inside a coil of wire whenever ...
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### Current induced in loop moving out of magnetic field : contradiction using Fleming's right hand rule

In the picture shown magnetic field exists into the plane (denotes by the X) and the loop (iii) is moving out of the region of the magnetic field. According to Lenz's law, the induced current will ...
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### Why does magnetism move electrons in a conductor?

What is to account for at the atomic level which gives magnetism its force upon electrons in a conductor? Why does the Lorenz force work?
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### On electromagnetic induction. Does larmor precession cause electron flow in a conductor?

What is happening at the atomic level which makes it necessary for a magnetic field to be changing with time in order to induce an EMF in a coil of wire? Why won't a constant magnetic field induce an ...
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### Need help understanding electrostatic induction in regards to the 'Thompson (Kelvin) Water Dropper'

...Aka the Kelvin hydroelectric generator, the Kelvin electrostatic generator, or Lord Kelvin's thunderstorm. Let's start with 2 metal cups, one above the other, in such a way that the top cup can ...
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### What happens at during the transition of solid to liquid in a magnet?

So I just watched this video; https://www.youtube.com/watch?v=8i2OVqWo9s0 and I did a little looking through my physics book, and online, but I couldn't find an answer that explained it in simple ...
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### Voltage generated in moving wire

hyperphysics: When a conductor moves through a magnetic field, there will be a generated motional emf. This is one example of Faraday's Law and it arises from the magnetic force. I don't ...
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### Induction heating

An induction cooktop has a high frequency power source that is applied to a coil. I was wondering if you could take the high frequency electronics on a cooktop and instead of a coil take a 30 or 90 ...
Using $$F_\text{magnetic} = (BIL)_\text{wire} = (BQv)_\text{particle}$$ we can say $F\propto v$ as $B$ and $Q$ are presumably constant. Is the magnetic force proportional the radius, or distance, ...