All Questions
60
questions
1
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101
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What feels the force that is equal and opposite to the Laplace force?
The Laplace force is the force applied to a current-carrying conductor in a uniform magnetic field:
$$ \vec F = I \vec l \times \vec B $$
It has been described as a macroscopic view of the Lorentz ...
- 111
0
votes
2
answers
87
views
How does magnet follow both law at same time newton 3rd law but also magnetic field?
have been wondering a question that:-
It is said that " magnet(say,Magnet no.1) has a magnetic field that informs in which direction the north pole (of other magnet or compass say , magnet no.2) ...
4
votes
2
answers
2k
views
Is Newton's law really invariant under Galilean transformation (for velocity-dependent Lorentz force)?
Consider the motion of a charged particle of charge $q$ and mass $m$ from two different inertial frames $S$ and $S'$ connected by Galilean transformation equation ${\vec r}'={\vec r}-{\vec V}t$. This ...
- 11.8k
1
vote
2
answers
100
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How do we apply force on a body?
We know that force is apllied either by pushing or pulling anything.
But how do we push or pull or apply force on anything.
I imagine the object A that is pushing and another object B that is getting ...
user316791
0
votes
2
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170
views
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
2
votes
1
answer
225
views
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 ...
- 69
0
votes
0
answers
52
views
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 ...
26
votes
14
answers
4k
views
Explaining how we cannot account for changing acceleration questions without calculus
For context, I am a high school physics teacher.
I am teaching students about the basics of electromagnetic force between two point charges. The equation we use is $F=\frac{kq_1q_2}{r^2}$.
This gives ...
1
vote
0
answers
47
views
Unstable Equilibrium of hinged rods
I conjured up a scenario where there are two rods free to rotate about a hinge connected by their ends by spring of spring constant $k$,both their masses are $m$ and length $l$ and mass is uniformly ...
2
votes
2
answers
932
views
How is force transmitted across a body?
So I am leaning about various topics like physics like simple machines, center of mass, momentum, energy conservation, equilibrium but the more I study these "upper" level concepts the more ...
- 823
6
votes
4
answers
224
views
Action-reaction pairs with electromagnetic waves
Suppose that a tower is releasing radio waves. These waves are received by an antenna. The radio waves apply force to the electrons in the antenna. My question is that by newton's third law, every ...
- 71
0
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1
answer
314
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Newton's third law between moving charge and stationary charge
Between two stationary charges, Newton's third law holds. But what if one of the charge is moving? Like, in moving charge, electric field is different with the field generated by stationary charge.
...
- 264
4
votes
2
answers
742
views
Why friction is attractive force whereas normal reaction is repulsive?
Both friction and normal reactions are contact forces. And according to what my textbook states both are of electromagnetic in origin. If so why normal reaction, say a block on a table pushes it away ...
- 310
0
votes
2
answers
858
views
Does an initial condition of "at rest" mean that the velocity is zero, but the acceleration could be nonzero?
I'm solving a differential equation for the relativistic motion of an electron in an electric field. The electron is initially at rest in the uniform field, but I am not sure if the initial condition ...
- 171
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2
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2k
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What are the different types of energy transfer?
[NOTE: The definition of work that I am using is the following-
Work is the transfer of energy that occurs to/from an object when a force acts on it to cause a displacement.
]
In my physics book ...
user238497