All Questions
Tagged with electromagnetism inductance
383
questions
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241
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Current through a capacitor in AC Circuits
I'm a little confused on the equation for the instantaneous current through a capacitor in AC circuits.
My textbook has it as:
$$i_C = \omega CV \ cos(\omega t + \pi/2) = -\omega CV \ sin(\omega t)$$
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4
answers
197
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Why $di/dt$ in inductor circuit reduces gradually after closing the switch?
When we close circuit having an inductor, an induced emf is generated across the inductor which opposes change in current through the circuit. This back emf depends on rate of change of current $di/dt$...
1
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2
answers
223
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Doubling the length of a solenoid doubles its inductance. Two identical solenoids in series have up to four times the inductance due to M. Why?
The inductance of a long solenoid with $N_o$ turns and a length $l_o$ is
$$L_o=\pi r^2 \mu_0\frac{N_o^2}{l_o}$$
If I now make a new solenoid, $L_{new}$, with double the length of the original ($l_{new}...
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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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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
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293
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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 ...
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2
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85
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Self-Inductance of a coil: What is the logical reason to not just write $\Phi = L * I$ but we also add the factor $N$ to the left side?
What is the reason to not just write $\Phi = L\cdot I$ but we also add the factor $N$ to the left side? ($N\cdot\Phi = L\cdot I$)
$\Phi$ is in Webers here, and is the induced magnetic flux.
$L$ is the ...
- 415
1
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1
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179
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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
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What position axially within a solenoid gives the maximum magnetic force?
Assuming an infinitely long shaft, which is held stationary at a given position in the coil, where should interface Y be positioned along length x such that the plunger experiences the maximum force ...
- 169
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Apparent contradiction in Ampere law for a solenoid
This picture in Wikipedia is supposed to explain the solenoid formula for the magnetic field $$B l= \mu_0 N I$$
(assuming steady currents).
But this would be true if one consider only the part of the ...
- 487
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2
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215
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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
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1
answer
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 ...
2
votes
3
answers
72
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If An Instantaneous Force Causes A Charged Particle To Briefly Accelerate, Does Self-inductance Decelerate It?
Consider the following example:
A charged particle initially at rest briefly accelerates in the forward direction due to an initial force. At this point the particle is carried forward only by inertia,...
0
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1
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192
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Self-inductance of a finite solenoid
Where did the $l$ in the denominator come from? I am talking about the $l$ in muNI/2l[...]?
I can't match LHS and RHS.
1
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1
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288
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Is this an accurate equation for describing the magnetic force exerted by a solenoid on a ferromagnetic material?
I saw this question, which contained an equation describing the strength of a solenoid:
$$F = (NI)^2\mu_0\frac{\text{A}}{2g^2}$$
where:
$$F$$ is the force the solenoid exerts on a ferromagnetic ...
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