All Questions
Tagged with capacitance electromagnetic-induction
25
questions
0
votes
2
answers
57
views
Growth of Current in an Inductor Connected Across a Battery [duplicate]
When baterry is connected across inductor with no resistance in circuit, won't the current flowing through it be zero, as inductor back emf will counteract the effect of potential difference due to ...
0
votes
2
answers
73
views
Cannot catch a minus sign mistake when deriving the ODE for an LC circuit
It's probably a very basic question but I just cannot wrap my mind around it. I'll just try to derive the differential equation for an LC circuit:
According to the law of induction, in a solenoid we ...
- 4,887
0
votes
0
answers
70
views
Why does this RLC behavior differ from what equations predict?
In order to better understand RLC behavior under current sources, I constructed the simple circuit below and attempted to analyze it. However, my equations do not agree with simulation results.
The ...
- 309
2
votes
5
answers
109
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Magnetic field in a capacitor in a $LC$ circuit
Consider a simple $LC$ circuit in which the charge on the capacitor varies sinusoidally. Current flows in this circuit, changing the charge on the capacitor and hence changing the electric field ...
- 29
6
votes
1
answer
531
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If a loop is not complete, and magnetic field passing through it is changing; will their be emf induced in the loop?
In a setup like the one show in the figure:
Will there be an induced EMF across the loop(given that the field is increasing)?
(my dilemma is : since the loop is not complete, we cannot define the ...
- 63
2
votes
0
answers
62
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How to measure voltage induced in coil due to an oscillating bar magnet using null method? [closed]
Here we're trying to measure the maximum emf induced in the coil using null method.
I can understand what the book means by 'a kick'. I can't understand how this circuit works. For example, how is the ...
- 21
0
votes
1
answer
111
views
Polarity of induced EMF in an LC oscillator
The image given belongs to my textbook (NCERT Grade 12, Chapter-7, Alternating Current, Pg No 255):
For your reference, this is the paragraph adjacent to the picture.
I believe that the polarity of ...
- 1,638
0
votes
3
answers
575
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Confusion regarding charge on capacitors
While I was studying about capacitors I realized that charge on the outer surface of the plates is zero when both the plates are given equal and opposite charges. Now mathematically, this realization ...
- 21
0
votes
2
answers
46
views
Area of reference to find magnetic field inside a (dis)charging capacitor
Faraday's law of induction can be expanded:$$V=-N\frac{d(BA)}{dt}$$ and for a circuit which creates an area between the wires if that area doesn't change then it becomes $$V=-N\frac{dB}{dt}A$$ The ...
- 425
0
votes
1
answer
72
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How does current/component voltage phase difference calculated in pure circuits remain the same for mixed circuits?
In class, we derived the phase difference values between the component voltage and the circuit current for pure inductive and capacitive circuits. Later, while doing LR, RC, and LC circuits, we used ...
- 256
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0
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93
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How to find voltage gradient using electrodes?
I have a capacitor, and between them I have an array of electrodes stacked orthogonal to the capacitor plates. The capacitor is running an AC current, and the electrodes are measuring voltage.
What I ...
- 712
0
votes
1
answer
52
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Inductor real charcaterstics when connected to an ac supply
When we connect a dc source to an inductor we always use a resistor there so after solving that RL D.C. circuit we find an exponential function (e to the power R/L based)
But when we are considering A....
- 1
0
votes
1
answer
134
views
Voltage between parallel capacitor plates
We know that $C=q/U$.
We know that the voltage is the potential difference between the plates.
If we have a capacitor on which we apply voltage, the one plate charges up and induces the other one with ...
0
votes
0
answers
136
views
rotating capacitor question
Imagine a simple setup.
I have a copper disc and another copper element held close to the disc at one of it's sides, this element is stationary but the disc is rotating, the part between the disc and ...
- 91
0
votes
3
answers
347
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Amount of energy that can be stored from Faraday flashlight / linear alternator?
You'll have to forgive me if this question is either extremely elementary or does not make sense — I am a civil engineer with little E/M physics background beyond high school education.
I am working ...
