All Questions
8
questions
3
votes
1
answer
208
views
What is the electric field around an inductor?
This question comes from this Walter Lewin video at 35:00 where he says "I'm going to confuse you even more" (and I suppose he somewhat succeeded). Walter Lewin claims there is an electric ...
- 8,640
1
vote
1
answer
146
views
Definition of inductance and volume currents
If I have a uniform, infinitely thin current. The relationship between inductance and current by definition is:
$\phi_{B} = L I$
Where inductance($L$) the proportionality constant between a wires ...
- 6,636
3
votes
2
answers
246
views
Using Faraday's law twice
I have trouble understanding Faraday's law when there is an induced current which in turn induces another current in the same circuit. I shall illustrate my confusion with an homework problem and I ...
- 963
1
vote
0
answers
144
views
Deriving solenoid inductance using Faraday's Law
The inductance $L$ of a long solenoid of length $\ell$, cross-section area $A$, and turns per length $n$ is given by:
$$
L = \mu_0 n^2 \ell A
$$
where $\mu_0$ is the magnetic constant.
I am currently ...
- 111
1
vote
1
answer
3k
views
Factor of two for inductance of parallel plates
Studying transmission lines I am confused about a "missing" factor of two in the formula $L = \mu_0 a/b$ for the inductance per unit length of two "infinite" parallel sheets.
Say we have two parallel ...
- 683
0
votes
4
answers
1k
views
Spherical magnet inside a solenoid
When passing a bar magnet through a long solenoid why is it that the induced emf when the magnet is in the middle of the solenoid is zero? And if a spherical magnet is put inside the solenoid, will ...
- 27
8
votes
1
answer
1k
views
Reluctance of torus shaped iron core with embedded wire loop
Imagine a circular wire loop (r = 50mm), the wire has an assumed diameter of zero, which is embedded in a torus shaped iron core with a circular cross-section of R = 10mm.
A current in that loop would ...
- 153
18
votes
3
answers
11k
views
Faraday's law - does the induced current's magnetic field affect the change in flux?
I've had this conceptual problem with Faraday's law and inductance for a while now.
Take the example of a simple current loop with increasing area in a constant field (as in this answer). So Faraday'...
- 533