All Questions
124
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Doubt regarding the calculation of EMF due to self-inductance and mutual inductance
When finding the EMF induced in an inductor due to both self-inductance and mutual inductance, the EMFs due to both of these contributions are summed. However, I have doubts regarding their summation.
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- 65
1
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31
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Inductance in case of volume and surface currents [closed]
Is inductance always just defined as the constant relating flux directly to current? Is it true even for surface and volume currents?
- 468
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2
answers
296
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Does the EMF induced in an inductor due to mutual inductance equal the total EMF?
For an inductor in a circuit without a power source, does the induced emf found by using the mutual inductance value include self inductance, or is the self induced emf considered separately?
From ...
- 65
1
vote
1
answer
182
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Are we always allowed to treat an inductor as a battery with the same voltage?
When there is an induced emf, Kirchhoff's Loop Rule no longer is true, because electric fields are nonconservative when there is an induced current, as stated by Faraday's Law:
However, I have seen ...
- 323
0
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1
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44
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Induced emf by a single wound coil
I was reading Electromagnetic Induction chapter and a question came on my mind..
If I use a circuit with a battery and a single wound coil,and I pass 2A current through it,when the current will pass ...
0
votes
1
answer
99
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Work done by battery [closed]
In charging a capacitor to a charge $Q$
Is there an equivalent to this in setting up current through an inductive circuit?
Energy stored in inductor $= 1/2Li^2$
What would be the work done in setting ...
- 3
0
votes
2
answers
73
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What is the difference between the self-inductance of a branch and self-inductance of a loop in lumped circuit models?
When we talk about lumped circuit model, I get confused about the terminology that is generally used. For a loop, we do know that the total flux through the loop can be written as $\Phi = \Phi_{ext} + ...
- 1,000
1
vote
3
answers
112
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Inductance in AC circuit
Why does an inductor oppose a change in current and not voltage? Is it a rule or is it because of lenz's law? Because intuitively the back e.m.f which opposes a change in current should also oppose a ...
- 117
4
votes
1
answer
299
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Why can voltages be summed around a circuit if there is magnetic induction?
So there is this class I'm attending on Electronic Instrumentation which involves mostly circuit analysis. For example, RCL circuits, and circuits that also contain opamps, transistors, diodes, etc. ...
- 117
1
vote
2
answers
515
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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
2
votes
3
answers
644
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How is EMF still induced in an incomplete/open circuit?
I understand that current can't flow through a coil if it is not complete, but surely this means that if a magnet is dropped through the coil, no EMF would be induced either, since work is done when a ...
- 31
0
votes
2
answers
431
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Is the voltage drop across an inductor in a purely inductive circuit equal to $X_L\times I$ or back EMF?
In a purely inductive circuit, due to Kirchoff's voltage law we say that voltage drop across the inductor is equal to (negative of) applied AC voltage. However whenever we calculate the voltage drop ...
- 21
1
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0
answers
64
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Inductance and Mutual inductance
Question: Three coils with inductances $L_1, L_2$ and $L_3$, as well as mutual inductances $M_{12}, M_{13}$ and $M_{23}$ are connected in series. What is the total inductance?
The right answer is $L_1+...
- 13
5
votes
5
answers
2k
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Where does the energy stored in inductor go on opening the switch?
Suppose we have a simple RL circuit. At $t=0$, I close the switch so that current starts flowing in the circuit. When the steady state is achieved, current $i=\frac{\epsilon}{R}$ would be flowing in ...
- 123
1
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2
answers
1k
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How can we derive the polarity of the induced voltage in an inductor?
As we know, the voltage-current relation of a two-terminal constant-inductance inductor is:
$v_L(t) = L \, \dfrac{\mathrm di_L(t)}{\mathrm dt} \tag 1$
I've managed to prove that equation without ...
- 344