All Questions
Tagged with electromagnetism forces
524
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Pulling force of an electromagnet lock
I saw a magnetic lock on the front door of my apartment building and was wondering the holding force of it. I read that they easily have a pulling force of thousands of newtons. The one in my building ...
- 113
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What direction does magnetic dipole moment feel force in parallel magnetic field?
Suppose I have a magnetic dipole oriented vertically in the $\hat{z}$ direction so
$$ \vec{m} = m\hat{z}$$
And the position vector to it is $\vec{r} = z\hat{z}$. It's entirely on the z-axis.
We're ...
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2
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113
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Lorentz force vector
I’m trying to calculate a Lorentz vector in $\mathbb{R}^3$ with those vectors but I keep getting an integer as an answer:
There’s a velocity vector of $(3,-2,1)$ , a magnetic field vector of $(1,2,-2)$...
- 132
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Magnet layout to maximize magnetic attraction along entire surface
We want to use permanent magnets to attract iron filings. For this, we have several neodynium magnets shaped as disks and we would like to lay them out to have the highest possible attraction along ...
- 25
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3
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477
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Why is the magnetic force not doing work on the falling current carrying wire?
Given that the loop of wire is falling down and the magnetic flux is changing, a current is induced in the counter-clockwise direction.
When calculating the force on the wire, $ Ids \times B $, it ...
- 493
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Why does the extended Lorentz force law have a negative sign?
I read on a textbook (and Wikipedia) that, if there were magnetic charges, the theoretical corresponding Lorentz force law would be
$$
\mathbf F = q_m\left( \mathbf B - \frac1{c^2}\mathbf v \times \...
- 543
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Lorentz force transmitted to two nodes
A straight wire of length $L$ and direction $\vec{u}$ carrying a continuous current $I$ in the presence of a magnetic field $\vec{B}$ experiences a force (Lorentz force) equal to $\vec{F} = LI \vec{u}...
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Is there a mathematical limit to the summation of infinitesimal magnetic and electric field in the Lorentz Force?
The addition of infinitesimally small parallel electric and magnetc fields, irrespective of their origin or source, or physical feasibilty; seems to produce a seemingly impossibly large force. Or at ...
- 441
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1
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Why do motorbikes' tires have very little to no tread, while cars' tires must have deep treads?
I have noticed that on the road, most motorbikes' tires have little to no tread. Even when I look at parking motorbikes that are used in everyday roads, some have even slick tires, or very little ...
- 29k
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Why is electromagnetism considered a non-contact force?
The four fundamental forces (gravity, the strong force, the weak force, and electromagnetism) are all supposed to be non-contact forces. Yet, electromagnetism governs all contact forces between ...
- 13
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Will solenoid expansion take place when current is flowing though it?
I came across this when doing my revision exam paper and had this doubt. I wanted to ask whether a solenoid will expand radially outwards when current flows through it.
(The actual question was ...
- 79
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3
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Is it possible to create a magnetic environment where it pushes and pulls at the same time, making the target “levitate”?
To better understand why I ask this, the backstory is I’m getting more and more annoyed by rolling office chairs rotating, hitting my ankles, hard to switch directions when wheels having ~90 degrees ...
- 111
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Question on thinking about an electric charge as multiple electric charges in special relativity
I understand that thinking about permanent magnets as a rotating loop of charged particles can be used to derive things like how an electric charge will be effected by the magnetic field, and to ...
- 2,001
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3
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If there are huge gaps between atoms relatively to their size, why can we touch things? [duplicate]
Most of the volume of an object actually consists of empty space rather than molecules. So why don’t solid objects move through each other?
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Force (linear and rotation) field between two magnets [closed]
Say I have the magnetic field of two magnets $S_1$ and $S_2$ as well as their respective magnetic moments. Each of their field strengths is modeled by a series of vortexes on a 2d plane. What is the ...
- 3
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170
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Confusion regarding the origin of Normal reaction
While reading about the normal reaction for different scenarios, I faced minor confusion regarding their origin.
Suppose a mass is kept on a surface. The mass exerts a downward force indirectly due to ...
- 1,791
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324
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Can an ideal dipole experience an electric force?
It is known that electric force a charged body is given as $\vec{F} = q \vec{E}$ given that $\vec{E}$ is uniform. Now, for an ideal dipole, what would we take as the charge for calculating the force ...
- 7,980
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How can I determine a direction of force which is made by magnetic field and current with a wire? Fleming left hand rule seemingly not works at here
Please assume that the conductor of wire exists , and the current flows from below left to above right like shown in the above diagram.
As shown in the above diagram , the uniform magnetic fields are ...
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30
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Is there a force that moves a magnet in a static field perpendicular to its direction of motion?
I’m wondering if any configuration of magnets or wires will cause a magnet or magnetizable material moving in proximity to be directed perpendicular to its current direction of motion.
I spent some ...
- 2,714
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70
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Electrical force combined with the equation of motion
I read "The Feynman Lectures on Physics Vol II The New Millennium Edition" and the equation (1.2) stated that we can combine electrical force with the equation of motion and get:
$$\frac{\...
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Does the Lorentz force change when an electric current is under a magnetic field with negative permeability?
Most applications of the Lorentz force depend on the electric current passing by a material with positive permeability, normally ferromagnetic.
How much would change were the electric current to pass ...
- 441
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225
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Magnetism rail problem
A circuit with resistance $R$ is given. The emf $E$ in the circuit is produced by a conducting rod moving with constant velocity in a uniform perpendicular magnetic field. The rod is sliding on ...
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91
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How to calculate/understand the Lorentz force of a continueous charge distribution
I know that the Lorentz force formula is $$F=\iiint \rho(E+J\times B)dV$$ for continuous charge distribution. But is E the electric field that creates the current (density) J, or this is another ...
- 179
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Forces on a closed container that can electromagnetically suspend objects
If you have a closed container (without air or other fluids, only with the object inside) that can electromagnetically suspend or maintain (not like if the container walls are covered with a single ...
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161
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Tesla to Newtons Over Given Distance
I have a Neodymium magnet, for example, that has a magnetic flux density of $1.25 \;\text{T}$ and is 1 inch by 1 inch by 0.44 inches. I have a steel ball with a diameter of 0.5 inches placed 3 inches ...
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2k
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Relating Teslas to Force
I'm attempting to design a solenoid that pushes on a permanent magnet. I have a specific amount of force I need to apply to the magnet. I cannot, however, find anything on relating Teslas to direct ...
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6
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2k
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What exactly is force? What is its source or origin?
I am asking this question here after trying to do much research and study to understand it on my own first. I am not sure if I am asking a metaphysical question that really can't be answered in ...
- 823
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How is pulling on a rope attached to a cart due to electromagentic forces?
I have read in some textbooks (such as Griffiths' Electrodynamics) that ultimately there are only four forces underlying all physical phenomena: 1) Gravitational 2) Electromagnetic 3) + 4) Weak and ...
- 115
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Since photons are said to be the force carrier of electromagnetic force, does it mean that photons get transferred from golf club to golf ball?
Just like it says in the question title. I have heard that photons are force carriers of electromagnetism.
Is it not true, that when a golf club imparts force on to a golf ball, then the fundamental ...
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Is EMF a force? [duplicate]
I had a confusion. EMF stands for electromotive force. Is it a force? I have a short question and I can't elaborate more but this site is not allowing me to post so I am writing.
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