All Questions
16
questions
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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 ...
- 33
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0
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33
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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 ...
- 441
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
0
votes
1
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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_{\...
- 193
0
votes
2
answers
157
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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 ...
- 341
1
vote
1
answer
221
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Would a ring magnet around a copper tube be slowed?
if a ring-shaped magnet was dropped with a copper pole through the center would it be slowed the same as a cylindrical magnet in a copper tube? if so would it be slowed more or less?
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1
vote
2
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393
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The variation of induced EMF $\varepsilon$ with time $t$ in a coil if a short bar magnet is moved along its axis with a constant velocity
The variation of induced EMF $\varepsilon$ with time $t$ in a coil if a short bar magnet is moved along its
axis with a constant velocity
tack.imgur.com/hWpO5.png
can someone kindly tell the ...
- 21
0
votes
2
answers
1k
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Electric field in a vacuum
By changing the magnetic field can we generate electric field in a vacuum ?
By the Faradays law of EMI if the magnetic field associated with a coil changes, current is induced in that coil
So if we ...
user324098
0
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0
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157
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How Lenz's law is based on conservation of energy?
To be honest, I understood Lenz's law. It doesn't violate conservation of energy. Kinetic energy gets coverted to electromotive force (EMF). But why?
Like in case of upward thrown ball, kinetic ...
- 435
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1
answer
156
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Why is there no EMF induced or flux change of the left ring zero? [closed]
I tried by dividing the system into three parts, and flux is increasing for the left most and right most part and decreasing for middle, but am not able to arrange this in form of a battery, any help ...
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2
answers
2k
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Flux and emf induced graphs when magnet is dropped through a coil
I've been told that if you drop a magnet through a coil the induced emf and flux graphs would look like this:
I understand that when the bar magnet is in the middle of the coil the emf induced is ...
1
vote
0
answers
57
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How to determine the "polarisation" of the magnetic field caused by magnetic induction?
I'm having trouble wrapping my head around the idea of magnetic induction caused by the current flow in a wire.
Considering that the magnetic field created by current flow is circular in its very ...
- 573
1
vote
1
answer
432
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What is the magnitude of the Induced Magnetic Field (From Lenz Law) [closed]
I'm having trouble understanding the following:
Assume a closed circular loop with a resistance $R$. A changing magnetic field $B$ flows through the closed loop. The induced EMF is:
$$EMF = \frac{-d\...
- 33
0
votes
0
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29
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What's the direction of the current in this circle if a magnet is approaching (or distancing from) the circle? [duplicate]
I'm not a native speaker so I don't know how to properly describe the problem I'm having right now
We got a circuit, it's a circle, and it's placed at the left. We also have a bar magnet which is ...
- 101
3
votes
1
answer
461
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Lenz' law and magnetic moment
Lenz Law says that the induced current will circulate in a direction such that it produces a magnetic field that is opposite to the change of applied magnetic field. For example, if the loop is a ...
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