Questions tagged [self-induction]

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Why does the self-inductance of a straight wire decrease when its radius increase?

I made some research on the self-inductance of a straight wire, and many sources cited “Inductance Calculations” of F.W. Grover. So I read a bit of that book but I couldn't find the answer to my ...
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1answer
96 views

Can Induced electromotive force affect itself?

At first, I want to say that I'm not English speaker, so my question might be very hard to understand. And also this question must be a silly question because I can't find any question like this... I ...
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4answers
163 views

What is the recommended battery chemistry for digital multimeters?

I would like to know if the different internal resistances of different battery chemistry somehow affects the calibration of a digital multi-meter. If so, then what would the optimal battery ...
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3answers
189 views

Self-inductance of toroid of rectangular cross section (N=windings?)

I have found a lot of answers about how to calculate the self-inductance of toroid of rectangular cross section, however my question says that "The winding are seen as a thin homogenuous currentlayer ...
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1answer
503 views

What is polarity of self induced emf?

This is what i've drawn...assume that switch is working rapidly.the first figure shows the direction of magnetic field due to current from battery. Which is proper.but i get confused about second ...
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3answers
210 views

What makes the self-inductance in a series LR circuit to fail stopping current forever?

This might be absurd question for many here but I'm trying to picture a bit in depth what is happening in an LR circuit and confusion arises. Below is how a series LR circuit behaves when the switch ...
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1answer
58 views

Do the self-induction cause change in magnetic field which again causes a self induction?

my question is: It is known that for a coil, if current is changed then the magnetic field inside the coil is changed, and the coil tries to oppose this change by inducting itself However, should ...
5
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2answers
746 views

Does the Commutator of a brushed DC motor cause inductive kickback

I'm new to electricity. Textbooks on brushed DC motor talk about inductive kickback when we DISCONNECT the power supply from the motor (and the stuff to protect against it e.g. by adding a diode/...
1
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1answer
414 views

How Armature reaction is different from Self inductance?

It was given in "Electric machinery Fundamentals" by Stephen J. Chapman book that Armature reaction and self inductance is different. Contribution from armature reaction is considered as voltage drop \...
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5answers
2k views

How does the inductor ''really'' induce voltage?

I'm trying to understand the concept but I can't find what I'm looking for. Sorry if I'm wrong at some points as it's the first time I'm studying these stuff. I understand that when I have an RC ...
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1answer
98 views

Connecting two electromagnets against each other to study self-inductance

In one article explaining the self conductance a figure like this was used: I added the field lines by myself, what I have noticed in it is the way the two electromagnets are connected by, and I asked ...
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2answers
2k views

Induced EMF in a transformer

In a transformer a sinusoidally varying voltage is applied to the primary coil of the transformer which give rise to a time varying flux which induce another sinusoidally varying EMF in the primary ...
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4answers
2k views

Why skin effect happens at the center of a conductor?

I was reading an article about Skin Effect. I know what skin effect is, but I wanted to know what causes it. Why is the back EMF strongest at the center? Why is it not distributed uniformly at the ...