All Questions
39
questions
1
vote
0
answers
127
views
Coilgun projectile force calculation
Please excuse me if I am completely wrong because I am a 9th grader but I hopefully am able to explain briefly about my problem. I was trying to create a function to calculate the Force of an iron ...
- 11
0
votes
1
answer
50
views
What is the force between two charges moving at 0.5c relative to each other? [closed]
Suppose two charges, $q_{1}$ and $q_{2}$ are in uniform translational motion relative to each other. If the relativity velocity is relativistic, e.g. $0.5c$, how can the force between the two charges ...
- 79
0
votes
0
answers
26
views
Where does force act in two parallel current carrying conductors?
F=ILB.so consider length as 5 m and I as 2 ampere and B as 5 T.so the force is 50 N.does this 50 N act at one point or equally applied on full length like pressure.So what does force/length in this ...
- 1
1
vote
1
answer
67
views
Tension generated in a metallic loop placed in a time varying magnetic field [closed]
We have a metallic wire circular loop of resistance $R$, having radius $a$, placed in a magnetic field $\bf{\vec{B}(t)}$. The magnetic field is perpendicular to the plane of the wire.
The magnetic ...
-3
votes
1
answer
63
views
My doubt is regarding the lorentz force
Consider a magnetic field in the positive z direction, and a charge +q moves with a velocity along the positive x direction. How do we know in which direction lorentz force on charge will be acting?
0
votes
1
answer
97
views
Lorentz force from potential- extra term?
I'm trying to verify the E.M potential energy $U= \int{A_\mu J^\mu} = q(\phi - A_j v^j )$ by using the connection:
$$
F= - \frac{\partial U}{\partial r} + \frac{d}{dt} \frac{\partial U}{\partial v}
$$...
- 2,142
0
votes
0
answers
354
views
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
1
vote
1
answer
200
views
Generalised Lorentz force expression from Classical Mechanics by Goldstein
I am reading chapter 7 in the 3rd edition of Goldstein's Classical mechanics textbook and the expression for the Lorentz force is confusing me. I cannot scan it so I am just going to write it out ...
1
vote
1
answer
64
views
Contradiction in Faraday's law and Motional EMF
Consider two parallel conducting frictionless rails in a gravity free rails parallel to x axis. A movable conductor PQ( y direction) of length $l$ slides on those rails. The rails are also connected ...
- 517
0
votes
1
answer
48
views
Force exerted by a charged ball on another one [closed]
Consider two charged balls in space with radii $R_A$ and $R_B$, and total charge $Q_A$ and $Q_B=\rho_B\space V_B$. They are separated by a distance $D = \|\overrightarrow{AB}\|\geq R_A + R_B$.
I was ...
- 103
1
vote
0
answers
103
views
Calculating acceleration that railgun is giving to moving projectile [closed]
so my younger brother is making project for school in physics and making a basic rail gun, where the projectile is launched, using rubber band, between two aluminum rails (13.8 cm in length and 0.56cm ...
- 11
0
votes
2
answers
130
views
What is the External force? [closed]
In a vacuum, a uniform electric field of strength $E$ is applied in the positive x-axis direction. When you carry a charged particle with a positive charge $q$ from $A$ to $B$, seek the work that the ...
- 3
0
votes
1
answer
167
views
Force Due To a Single current carrying wire
In class today we were given the situation of a single DC current carrying wire was trying to deflect a compass needle. We were told that the magnetic field of the earth was $5\times10^{-5}T$ and we ...
- 103
0
votes
1
answer
413
views
Showing the Minkowski force in the covariant form [duplicate]
So I would like to show
\begin{equation}
K^{\mu} = \frac{q}{c}F^{\mu\nu}u_{\nu} = \frac{q}{c}\left[\partial^{\mu}(A^{\nu}u_{\nu}) - \frac{dA^{\mu}}{d \tau}\right]
\end{equation}
and I went about ...
- 153
2
votes
3
answers
2k
views
Lorentz transform of force
If a particle of mass $m$ and velocity $v$ is moving due to a constant electric force what would the force be in the the frame where the particles velocity is 0?
To try and solve this I used the four ...
- 331