All Questions
34
questions
0
votes
3
answers
61
views
Can an inductor increase circuit current?
Suppose there is a simple circuit with a resistor, battery and inductor. The question that came to me is, by opening the circuit breaker, can the inductor be used to oppose and slow down the circuit ...
0
votes
1
answer
53
views
Why doesn't current flow stop in LC oscillation?
Why doesn't current flow stop in a LC circuit? It is supposed to stop when the magnitude of emf developed across capacitor is the same as the inductor, right?
0
votes
0
answers
49
views
What logic is being used in Bleaney & Bleaney to prove the reciprocity theorem for mutual inductance?
I'm currently reading Bleaney & Bleaney 3rd Ed. On pg 136 they discuss the case of 2 coils. Their logic is as follows:
If a second coil is brought near to a coil carrying a current $I_1$, there ...
- 126
0
votes
0
answers
29
views
Is AC voltage across transformer pi shifted?
Suppose the voltage in the primary coil in a capacitor be
Vprimary = Vosin(wt)
According to my understanding, as the (AC) current in the circuit increases, the Magnetic flux across the secondary ...
- 153
0
votes
0
answers
26
views
Determining the condcutivity of a material by method of contactless resistance caused by putting a sample rod in the inductor of an RLC circuit
I'm doing an experiment where I'm trying to determine the conductivity of a material by putting a sample rod in the center of a coil which is a part of an RLC circuit with an AC generator.
I was told ...
1
vote
1
answer
205
views
Current and Magnetic Poles of a Solenoid (Diagram) & Right Hand Thumb Rule
Well, my doubt's pretty elementary.
Firstly I wanted to confirm whether both the cases, as illustrated in the picture, are correct. I've darkened the part of each coil that faces us. Using the clock-...
- 72
1
vote
1
answer
72
views
Mathematical expression for self-inductance constant $L$?
Is there a mathematical expression for what the value of $L$ (self-inductance constant) is for a given geometry? I've tried to come up with something, but I don't know if it's right or not...
$$\phi_B=...
- 187
2
votes
4
answers
241
views
Inductor connected to an AC source
Consider an inductor connected to an AC source, $V=V_0\sin\omega t$.
Let the the switch in the circuit be closed at $t=0$. Then by Kirchoff's voltage law,
$$
V-L\frac{dI}{dt}=0
$$
where $I$ is the ...
- 23
0
votes
2
answers
215
views
Current through a coil due to Electromagnetic Induction
If we change the magnetic flux through a coil -->
Will any current flow through this coil if it's two terminal is not connected to any kind of load, i.e - It is not in a closed loop.
If the answer ...
0
votes
0
answers
61
views
Current in primary circuit when diode in secondary circuit is reverse biased
Let's say we have an ideal transformer with a diode in the secondary circuit:
If the diode is reverse biased, there would be no current in the secondary circuit, which would mean that there is no ...
- 3
1
vote
3
answers
437
views
How can it be justified that the phase difference between voltage and current for inductor is $\pi/2?$
The inductor is an ideal one, the phase difference is with respect to current, and the voltage varies by the law $V=V_Lsin(\omega t).$
One can prove that the current function will come out to be $I=...
- 480
0
votes
1
answer
67
views
Is their an inherent flaw in using a step down transformer for a coil gun
I am currently in my first year of an engineering program so just recently learned about the many wonders of electromagnetism. For a school project this year I went on to build a coil gun using the ...
0
votes
1
answer
183
views
Is self-inductance dependent on geometry? Is $\Phi$ net flux or just flux due to cirucit?
Self-inductance of a circuit is defined as $L=\frac{\Phi}{I}.$ But it is not clear what $\Phi$ (read phi) is. Is it net magnetic flux or flux due to the magnetic field created due to current in the ...
- 480
1
vote
2
answers
507
views
What is the amplitude of current in LC oscillations
Since there is no resistance in an LC circuit (not attached to an AC source), what's stopping the current from rising to infinite. And if resistance is provided by the inductor by self induction, then ...
- 105
0
votes
1
answer
114
views
Is an increase in inductive current caused due to an increase in magnetic field?
I'm studying Inductive current in high school. I learned the Faraday law, and that the voltage produced is equal to the delta of magnetic field flux over time.
So, I was curious about this topic and ...
- 3