Questions tagged [faradays-law]
26 questions
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4 answers
Why does analysis indicate that ground lifts do not fix ground loops?
Note: "Ground loop" in this question refers to a ground loop caused by linked magnetic fields. (Sometimes ground loop refers to slightly different scenarios.)
Recently I've been looking into ground loops a lot since I've encountered them in circuits…
PersonWithName
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5
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1 answer
Sinusoidally squeezing a capacitor
Assuming no load, how does continuously changing the distance between the plates of a capacitor (in a sinusoidal fashion for simplicity) affect the output voltage? Does electromagnetic induction come into play in this scenario?
I understand there…
WantsToKnow
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4
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What is the EMF induced between two points in a closed wire loop?
Farday's law says if I change the magnetic flux through a closed loop an emf would appear.
Between what two points is the EMF calculated?
Let's say that my calculations give me an E=−dΦdt=10V.
What is the EMF between AC? Is it different from the…
bibo999999
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2
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1 answer
Waveform of induced EMF in a basic AC generator
Consider the following simple generator. A bar permanent magnet is rotating at a constant angular speed by some external means. Two coils of wire are placed in the same plane as the axis of the bar magnet. The two coils are placed in the same line.…
alejnavab
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4 answers
Possible contradiction between Ohm's Law, KCL, KVL and Faraday's Law of Induction?
Let's say, we have a loop of wire of length \$L>0\$. Let's say, hypothetically, it is a loop of non-ideal wire. That means that the wire has a resistance per unit length \$ρ>0\$. Let's further assume that there is a changing magnetic flux through…
nc404
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Analysing the behaviour of inductor in the circuit
Suppose we have an L circuit with DC power supply of emf \$\mathscr{E}\$
simulate this circuit – Schematic created using CircuitLab
By KVL,
\$\mathscr{E}=L\frac{dI}{dt}\$.
This suggests that \$\frac{dI}{dt}=\frac{\mathscr{E}}{L}\$
As at \$t=0\$,…
Iti
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1 answer
How to find the points between which EMF is induced in a loop with resistors?
I recently came across a problem on Faraday's law, which had multiple resistors. The circuit looked something like this, with the loop rotating clockwise.
Personally, I felt that there would be three EMFs induced: one across the semi-circular loop…
math and physics forever
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How can the induced voltage be proportional to the frequency?
According to Faraday's Law, in coupled inductors, the magnitude of the induced voltage at the secondary coil is proportional to primary power source's frequency (V2 = w x I1 x M).
On the other hand, even though traditional transformers are basically…
ilyas aslan
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1 answer
What is the current induced in a wire connected to an ideal transformer using Faraday's law?
Imagine an ideal transformer interfacing an ideal current source with a ramp function \$i_1(t)=a t\$ connected to the primary winding and a resistor \$R\$ connected to the second winding. We want to know the current in the second loop \$i_2\$.
We…
1
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1 answer
Should the magnetic field outside a conductor be considered?
I've simulated a circular disc where a magnetic field is moving out of the page. The arrows in the picture represents the direction of its current density.
I'm wondering, will the induced current produces another external magnetic field near the…
Theta
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1 answer
What will be the graph of flux of coil 2?
In the following picture current is flowing through coil 1. Let's assume that current is increasing linearly in coil 1. Then emf induced in 2nd coil be will constant and having some negative value. What would be the flux in coil 2? How it could be…
Ahsan
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1
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2 answers
If the self-induced EMF in an inductor is 180° out of phase with source voltage, shouldn't they cancel out and net voltage should become zero?
I know that inductor opposes the change in magnetic flux linked with it. In case of an ac sinusoidal voltage applied across a pure inductor, the emf induced across the inductor is equal and opposite in direction to the source voltage. So the net…
Gaurav Av
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1
vote
1 answer
Why is lenz law not applied in this crcuit analysis
So in this circuit, initially the current and voltage is 0. At t = 0 the voltage snaps to V.
Now my analysis is:
According to Lenz Law the voltage developed will be in the direction as specified in red markings in the image because a back emf…
Allen
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1
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1 answer
Confusion between Faraday's law and Kirchoff's circuit law
Consider a voltage source V connected to a coil. By Faraday's Law e=-(dƛ/dt). I don't understand the direction of the induced voltage e making v=-e
However, if we treat the coil as a circuit element and use Kirchoff's law, v-e=0(since v is seen as a…
Nigel Goveas
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1
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1 answer
Faraday cage and static electric field
Can anyone explain - what is the difference between static and varying electro-magnetic fields?
I know the definition for what is static electric field. It does not change with time (0Hz frequency.) But I don't know the exact meaning of that.
Also,…
M.Arun kumar
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