Questions tagged [faradays-law]
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Example problem of induced emf in a coil travelling with some velocity and perpendicular to the earth's magnetic field
I have a example problem which I created myself just out of curiosity,
Question:
Let's say a copper wire coil(20mm dimeter(r=10mm)) of 3 turns(N=3) is moving along the surface(Note-coil is not ...
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Why are induction motor cores laminated to prevent eddy currents?
The permeable iron alloy cores of induction motor rotors are formed from thin laminated sheets, designed to prevent eddy current flow and thus "reduce losses", but isn't the whole point of ...
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Faraday’s Law and voltage balance
Does anyone know how to use Faraday’s Law and voltage balance to explain this equation?
I don't understand where jw comes from.
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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 \$\...
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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 ...
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Does the direction of coil winding impact the direction of induced voltage?
I have taken and modified a bit the following image from a similar question, where it was explained that the direction of the coil winding does not impact the direction of the current: Does coil ...
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Induced voltage in loop around wire in home AC circuit
I have an electric patio heater that has no indication of whether it's on or off. I want to wrap a loop of wire around its power cord, the goal being to induce a current that can power an LED to tell ...
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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, ...
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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 ...
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Constant Voltage Applied to Inductor
I'm seeking clarity on understanding what happens when a constant voltage is applied to an inductor. I gave this explanation in another thread and it was regarded as wholly misguided in the following ...
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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 ...
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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 ...
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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 ...
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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 ...
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Effect on current due to relative motion of load in homopolar generator
Description of figure -
A homopolar generator in which disc is rotating with constant angular frequency with respect to ground frame and a uniform steady magnetic field is present perpendicular to ...
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