All Questions
Tagged with electromagnetism inductance
384
questions
3
votes
3
answers
1k
views
Kirchhoff law and Inductors
I am struggling with using Kirchhoff's rule in circuits with Inductors. Looks like if you have an inductor, we have Electric field (E) that is created using a time varying magnetic field and that E is ...
- 1,481
3
votes
2
answers
266
views
Drum head coupled with an RLC circuit
I'm thinking about the possibility of an electroacoustic drum that would be tuned with some kind of RLC circuit.
The drum head would have an electromagnet attached to its center, which would be ...
- 133
3
votes
0
answers
194
views
Wave equation derivation in a transmission line
$$
V(x, t) = L\Delta x\frac{\partial I}{\partial t}(x, t) + \frac{1}{C \Delta x}\int{I_c(x, t) \; dt} \tag{1}
$$
$$
V(x + \Delta x, t) =\frac{1}{C \Delta x} \int {I_c(x, t) \; dt} \tag{2}
$$
$$
I(x) = ...
- 1,525
3
votes
1
answer
145
views
What do we mean exactly by inductance of two conductors?
I'll illustrate what I mean with a problem, but the question is not about this particular question. Instead I am looking for a general principle.
The problem is:
Calculate the inductance of a unit ...
- 326
3
votes
0
answers
124
views
Force vs Stroke for Open-ended Solenoid
If I understand correctly, the force (F) versus stroke (x) curve for a solenoid which is open ended (there is no plunger stop in the middle) is something like the curve below:
The plunger is forced ...
- 131
3
votes
1
answer
157
views
Dot convention inductors in series: what is going on
So I'm really confused with mutual inductors and dot convention. If your answer is going to be a link to any website I can assure I read them all and that only left me more confused. So here are my ...
3
votes
3
answers
9k
views
At $t=0$ the voltage across the Inductor will immediately jump to battery voltage. Why?
While reading transients i come to read......
"the voltage across the inductor will immediately jump to battery voltage (acting as though it were an open-circuit) and decay down to zero over time (...
- 1,441
2
votes
5
answers
10k
views
Is there inductance to a DC circuit?
When a DC circuit is carrying current, large amounts or small, is there induced-emf due to the inductance? Or is it only applied to AC circuits?
- 1,110
2
votes
2
answers
47k
views
Magnetic field at the center and ends of a long solenoid [closed]
A long solenoid has current $I$ flowing through it, also denote $N$ as the turns per unit length. Take its axis to be the $z$-axis, by symmetry the only component of the magnetic field inside is $B_z$....
- 73
2
votes
2
answers
573
views
Does an inductor stretch or compress when a current is passed through it?
If an inductor is given to you and it is connected across a battery without any resistance in the circuit,then will the inductor stretch,compress or remain the same length?
2
votes
2
answers
333
views
Inductance of air core inductor with and without load
I have an air core inductor whose inductance , as measured with LCR meter, is 45.1uH and quality factor is 4.4. When i place an Aluminum alloy (which is a Non-magnetic Material) as Load inside the ...
- 21
2
votes
3
answers
534
views
Why can't the current in a solenoid be changed rapidly?
Why can't the current in a solenoid be changed instananeously? My reasoning is since the current in a solenoid is given by a integral:
$$I(t) = \frac{1}{L} \int_{t_0} ^{t_f} V_Ldt$$
then if $t_f = t_i ...
- 548
2
votes
2
answers
563
views
Why do old transformers make sounds, but new ones don't?
What I think is that maybe insulation is gradually removed between plates, and eddy currents start passing from one plate to another and this produces sound. Am I right?
- 71
2
votes
1
answer
2k
views
How to imagine the first few moments of an LR circuit?
For example, there's a very simple circuit which only contains on resistor. So according to Ohm's law, we have: $\mathrm{emf} = IR$
As we know when time $t = 0$, the current must be $I = 0$. However, ...
- 123
2
votes
4
answers
250
views
Inductor connected to an AC source
Consider an inductor connected to an AC source, $V=V_0\sin\omega t$.
Let the the switch in the circuit be closed at $t=0$. Then by Kirchoff's voltage law,
$$
V-L\frac{dI}{dt}=0
$$
where $I$ is the ...
- 23