All Questions
39
questions
0
votes
2
answers
299
views
Calculating potential difference for fraction of loop with induced current
Given a circular wire loop of radius r, resistance R enclosing a magnetic field perpendicular to the plane of the loop that increases with time ($B=\alpha t$), I have calculated the induced current $I=...
user44816
0
votes
1
answer
205
views
How much does the magnetic force change in a solenoid with the distance between turns?
I was looking for answer in my physics book and in Internet but not. I guess that more distance should be an smaller magnetic field but I do not know how much.
- 3
1
vote
2
answers
1k
views
Find magnetic field in a solenoid for different regions? [closed]
Problem statement:
A steady current I flows along an infinitely long hollow cylindrical conductor of radius $R$. This cylinder is placed coaxially inside an infinite solenoid of radius $2R$. The ...
1
vote
3
answers
1k
views
Current through two inductors after a long time
I'm having trouble with visualizing the following problem, which is asking me for the final, steady current in both inductors $L_{1}$ and $L_{2}$. I was thinking that after a long time, essentially ...
- 111
2
votes
1
answer
7k
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determining Induced emf/current through v x B . l
I am working on a question from my book. I am wondering how they conclude emf is negative in this case. looking at $$ \mathcal{E} = \vec{v} \times \vec{B} \cdot \vec{dl}$$ If there's some implied ...
- 225
3
votes
5
answers
19k
views
Transformer: primary side & secondary side current 180 degree out of phase
I am a novice in electrical engineering. I notice that in transformer the secondary side current & current referred to as primary are 180 degree out of phase from each other.
But why it is so, I ...
- 347
4
votes
2
answers
2k
views
inductance value of a single turn thin circular coil
the question may seem simple but I haven't found any fitting formula yet. The problem is the following:
consider a single-turn, circular coil made of reasonably thin wire (diameter of the wire much ...
- 506
2
votes
3
answers
1k
views
Maximize Magnetic Self-Inductance Through a Wire
You are given a long length W of copper wire. How would you arrange it to obtain the maximum self-inductance? Why?
I am trying to use the equation
$$L=\mu_o n^2 l A$$
I try to solve it using a ...
- 123
21
votes
4
answers
41k
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Derivation of self-inductance of a long wire
Currently I am stuck, trying to derive the self-inductance of a long wire. According to literature it should be
$$L=\frac{\mu_r\mu_0l}{8\pi}$$
and in literature its derived by looking at the energy ...
- 1,573