All Questions
Tagged with electromagnetism forces
544 questions
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What is the correct way to find the total force due to gradient on a magnetic dipole? [closed]
Lets consider a wire of length L, along the axis of a magnet having a magnetic field $B_z(z)$ and gradient $G(z)=dBz(z)/dz$. As the wire moves along the axis, it has a magnetic moment density of $m'(...
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Finding the total force on an object due to magnetic gradient
I am trying to calculate force experienced by a line of length L with a magnetic moment varying as a function $\mu(z)=\rho z$ in 1d, where $\rho$ is the linear magnetic density.
The form of the force ...
- 31
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Electromagnet with parallel windings [closed]
I'm designing an electromagnet for an application where I don't have much space for thick windings, but I have room to add more windings vertically, like shown in the picture. Assume that both ...
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Thought experiment and possible contradiction between electromagnetism and special relativity (Part II)
A new thought experiment has recently crossed my mind to which I could not find a clear solution as yet. Assume that an observer $B$, holding a magnet, moves inside an electric field of $E_y$ at $v$ ...
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How is a lorentz force generated due to interaction of two magnetic fields?
A conductor is present through which current passes (like in a DC motor), it has a field of its own while the field of the stator interacts with the field of the armature (The conductor) causing a ...
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Does the electric field of a charged particle affect the particle itself? [duplicate]
I recently came across a question that got me thinking: "Does the electric field of a charged particle affect the particle itself?"
Here’s my reasoning against it:
Newton’s Second Law:
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Forces induced on a rotating DC motor
I am a geophysicist who was not really exposed to EM at my univesity. Pretty much all the focus was on seismic waves. As such, I am now trying to teach myself some EM from scratch.
So far it is going ...
- 405
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I need help with this physics homework problem regarding magnetic induction [closed]
My teacher says answer B is correct, but shouldnt it be C?
because as the car enters the field a repulsion force is produced decreasing it's speed while in the middle the force is constant so speed is ...
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Force experienced by two parallel current carrying wires [closed]
If we have two parallel wires, both carrying current but in opposite directions, separated by some distance, then force per unit length is calculated as
$$
F = \frac{\mu_0I_AI_B}{2 \pi r}
$$
But my ...
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Measuring the $B$ field in an experiment
I was watching a video on magnetic fields and I am trying to understand why is the magnet pushed down on the scale with the same force as the one from the wire by Newton's Third Law? Also why is the ...
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Does $\vec F=I\int\mathrm d\vec{l}\times \vec{B}$ give the force on a current carrying wire when it is in motion?
The standard derivation of the force on a current-carrying wire, $\vec{F}=I\int\mathrm d\vec{l}\times \vec{B}$, involves calculating the magnetic force on the moving charges within a wire element $\...
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Why do permanent magnets exert a constant force but the force from electromagnets varies between different objects?
I was testing out an electromagnet and found that force varied greatly between objects. A thick piece of metal was very hard to pull off but thin sheet metal was very easy. I tried a few different ...
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Is the Lorentz 3-force a 3-vector or 3-pseudovector?
Usually, we say that the Lorentz force is a vector. However, in group theory, we make a distinction between vectors and pseudovectors based on how they transform under $O(3)$. Vectors and ...
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The mass of magnetic monopoles
If there would be magnetic monopoles somewhere, such a way to bring Maxwell equations in a symmetric way, there should be a law of force describing the movement of such particles. If we imagine ...
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Stability Conditions for a Cylindrical Beam of Electrons: Analyzing Forces and Relativistic Constraints
A cylindrical beam of electrons with radius (R) and charge density ($𝜌$) is moving in vacuum. Assume the charge of the electron is (q), and at time (t=0), the velocity of the electrons is ($\vec{v}$ =...
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