All Questions
Tagged with electromagnetic-induction lenz-law
46
questions
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Back EMF in electromagnetic coil
I am trying to quantify the back EMF generated while actuating an electromagnetic coil, this would be included in a general calculation to estimate the coil output under a variety of conditions. My ...
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When a magnetic ball passes through a copper pipe vertically
Let's say a magnetic ball passes through a hollow pipe, which is a conductor (copper), vertically. We can observe that its acceleration is decreased when compared to a free gravitational fall.
By ...
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Magnetic forces do no wok
The magnetic field is pointing upwards and uniform.
Part C:
Since the magnetic field does not do any work, the initial velocity of the bar should remain constant through time.
But in the solution of ...
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Is there a magnetic force acting on a conducting ring falling due to gravity in presence of a uniform magnetic field that exists along $-z$ direction? [closed]
If so, then why? We know that a current carrying closed loop in a uniform magnetic field experiences no force but when it's suddenly pulled by an external force, according to Lenz law a magnetic force ...
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Does the net induced emf decrease in this case?
In a video from the YouTube channel veritasium about Misconceptions of electricity
It is said that energy is mostly of the electric fields produced by the surface charges and battery , which make them ...
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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 ...
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51
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Faraday's Application on a Magnetic Dipole
Consider a closed loop wire with current flowing through it:
Consider along the wire a battery $V$, a resistance $R$ and a capacitor $C$.
We know the integral form of Faraday's law:
$$\oint\limits_{\...
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The effect of the inner diameter of a tube on the speed of a magnet falling through it
I have done the experiment of dropping permanent magnets through copper tubes and observing how they fall slower. With a tube that has an inner diameter close to the permanent magnet (a tight fit) the ...
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2
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261
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How to explain different voltage and symmetry?
Imagine a magnet is falling along the axis of a uniform metal ring, there is an Eddy current in the ring due to changing magnetic flux and the direction of the current is determined by Lenz's law. ...
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140
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Magnetic field produced by a changing current
When a current changes with time, it generates a changing magnetic field, according to Ampere's law.
This changing magnetic field induces an electric field, according to Faraday's law of ...
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34
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Levitation of a permanent magnet over a conducting surface
I have seen a method of magnetic levitation where a magnet moves over a conducting surface with its north pole facing downwards (or the conducting surface moves below the stationary magnet). At a fast ...
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Understanding Electromagnetic Induction and Lenz's Law [closed]
I am having trouble understanding the concept of electromagnetic induction and its application, particularly in regards to Lenz's law. I am having trouble visualizing the relationship between the ...
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Current through a solenoid: magnetic field gives a staircase graph
We were running current through a solenoid coil with an iron core, and measuring the resultant magnetic field strength. We expected a purely linear relation for the "current-field strength" ...
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2
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180
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Conservation of Energy with respect to Lenz's Law with moving coil
My knowledge of electromagnetism is quite elementary but I think I understand WPE and the Law of Conservation of Energy well enough.
Here's what I understand of electromagnetic induction in a coil in ...
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2
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Is the concept of motional EMF consistent with Faraday's Law?
Consider a circular homogeneous metallic coil sliding on a smooth horizontal surface in a region of uniform magnetic field $B$ which is perpendicular to the face of the coil. By Faraday's law, the net ...
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