All Questions
60
questions
1
vote
1
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6k
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Can Newton's 3rd Law be considered as a direct consequence of the coulomb's law of electric interactions? [closed]
Let me explain my thought. Lets consider Coulomb's definition of electric force between two charges as the fundamental law. Under this consideration, forces between charges already follow What Newton'...
- 121
1
vote
2
answers
148
views
Levitation using Electromagnets - Forces
Here is a hypothetical (but potential real) situation:
I am holding electromagnet that weights 1kg. This electromagnet is being used to hold up a 10kg weight.
Would I feel like I am holding 11kg, or ...
user100775
0
votes
1
answer
703
views
Will dynamo generate electricity with reverse spin?
Will a dynamo generate electricity when it is spinning in opposite direction? If we alternate the rotation direction every minute, will it still generate electricity? How?
- 121
0
votes
1
answer
77
views
Should there be a linear force acting aside from torque?
Assume to identical motors are placed vertically on-top of a table and they are not fixed able to move/fall etc...and they have gears attached to them and are attached to one another like this image:
...
- 1,110
0
votes
3
answers
148
views
Traveling to Mars in 24 Days
I am trying to calculate an electromagnetic rail launch from the Moon but I need to know if humans can survive the launch. Please see the specs below.
150 miles of track
Proposed final launch speed ...
- 13
6
votes
1
answer
1k
views
Resemblance between Coriolis force and magnetic part of Lorentz force
If we interchange velocity with charge and omega that is rotation of a system with $B$, magnetic field, we get the same thing. Is there any deeper meaning to this same mathematical form?
- 1,803
1
vote
2
answers
57
views
Possiblity of predicting behavior of system when properties described as functions over space?
Suppose I am given a system that consists of a distribution of charged particles(which are all over space and are point-charges). They are described by a set of functions instead of variables. These ...
- 121
1
vote
1
answer
5k
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Electromagnet force equation clarification
So, from a previous previous question, I know what plane the force from an electromagnet will affect a ferromagnetic material in. I thought that would be enough, but working through some problems ...
- 1,340
0
votes
0
answers
3k
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Solenoid pull force & Velocity calculation
So I am building a circular accelerator (like a slightly oversimplified model version of CERN) as a physics project, and I'm at a dead end. I believe I need to know how to work out differential ...
- 1,340
0
votes
2
answers
610
views
Electrical force between two objects
I tried to solve the following problem:
There are 2 objects . The object m1 with charge q and the object m2 with charge q.(same charge).The object m2 is connected with a rope to the ceiling.
at the ...
- 397
3
votes
2
answers
507
views
Does constraint for speed of Electric and magnetic fields violates Conservation of momentum or Newton's third law?
I'm just a beginner so bear with me. Consider two frames at rest wrt to each other separated by distance enough for light to take a minute or so. At a given instant we create two large dipoles by some ...
- 31
2
votes
3
answers
4k
views
How does one calculate the force applied on an object by a magnetic field?
I've tried very hard to find an answer to this question, and every path leads me to an abstract discussion of fundamental forces. Therefore, I will propose two very specific scenarios and see if they ...
- 325
15
votes
2
answers
20k
views
What is the cause of the normal force? [duplicate]
I've been wondering, what causes the normal force to exist?
In class the teacher never actually explains it, he just says "It has to be there because something has to counter gravity." While I ...
- 253
4
votes
1
answer
172
views
3 current loops with non-conservation of momentum, when one specifically considers SIGNs
Thought experiment I.
Consider two loops of wire, 2 small dipoles B and C , with a common axis z (facing each other) and (say) 30 cm apart B to C. At the speed of light, information (including a ...
- 101
122
votes
10
answers
17k
views
How can I stand on the ground? EM or/and Pauli?
There is this famous example about the order difference between gravitational force and EM force. All the gravitational force of Earth is just countered by the electromagnetic force between the ...
- 1,321