All Questions
33
questions
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Force between two current carrying conductors
lets say I have two wires. each has a magnetic field due to its current. this magnetic field is present in the other wire causing a force in that other wire. Now I understand that changing the current ...
- 117
0
votes
1
answer
76
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Could you calculate the force between two NON-PARALLEL, straight current carrying wires?
Just like there are ways to solve for the force between two straight parallel wires, what is the way we could find the force between non-parallel wires?
- 23
0
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3
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86
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How can two conductors of unequal lengths exert a force of same magnitude on each other?
I understand Newton's 3rd Law states that if Object (conductor) A exerts a force on Object B, Object A will experience an equal and opposite force. However, in a current carrying conductor Lorentz ...
1
vote
4
answers
208
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What's the difference between $f= i (l × B)$ and $f= (i∫dl )× B$?
for any current carrying conductor of any arbitrary shape in uniform magnetic field experiences a force given by F = i (l × B) where l is length between end and start points of the conductor and in f=...
- 33
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26
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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
0
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1
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94
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Apparent singularity of Magnetic field generator by a ♾️ conductor [closed]
Let's assume two perpendicular wires: one is infinitely long and the other's length is $l$ (finite).
The second wire is placed vertically on top of the infinitely long wire and there is a distance of ...
- 11
0
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1
answer
66
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Force and magnetic field
what is the force on the piece of wire from the infinite conductor?? what is the force on the infinite conductor from the piece of wire??
- 17
1
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3
answers
250
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Why is the cross product used in electrodynamics [closed]
For example, $F = I \times B$. Why would the force be perpendicular to both the magnetic field and the current? Why would the resultant force be totally unlike its 2 sources; this could be likened to ...
- 213
0
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1
answer
175
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How is Lorentz Force $BQv=BIl$?
The formula for Lorentz Force on moving charge is $$F=BQv$$ which for current carrying wire is modified to $$F=BQv$$$$=BQ\frac lt$$$$=BIl$$
Where $l$ is the length of the wire inside the magnetic ...
- 1,168
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2
answers
2k
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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
2
votes
1
answer
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 ...
- 69
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0
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34
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Why doesn't a conducting wire in a constant magnetic field experience a force in the direction of the magnetic field?
Instead of using the wire's magnetic field for deriving using Newton's third law can't we do the opposite using the magnetic field produced by magnet ?
I mean why doesn't the wire simply move in the ...
1
vote
1
answer
93
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Vectors in Force experienced by a current carrying wire? [closed]
My textbook lays out the following explanation of Force experienced by a current-carrying wire:
My question is where did the negative sign of the charge on electron go? How did Drift velocity go from ...
0
votes
1
answer
66
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Physically, what does Force $×$ $d$(Current) measure?
Physically, what does $$\text{Force}\times d(\text{Current})$$ measure?
For example, if we have a boundary of a system and something flowing into the systems through the boundary. Then what is the ...
- 2,283
2
votes
1
answer
1k
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Why don't power lines swing due to magnetic force between them?
I've learnt that any current carrying wire produces a magnetic field around it. Also two wires carrying current in the same direction attract each other, whereas, two wires carrying current in ...
- 5,306
2
votes
1
answer
296
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Direction of force in current carrying conductor?
Question:
A staright conductor of circular cross section carries a current then, which of the following statement is true:
(a)No force act on conductor at any point
(b) An axial force act on ...
user182868
0
votes
1
answer
80
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Why is Jackson's expression for the force on a current distribution, ${\bf F} = \int {\bf J(x)} \times {\bf B(x)} d^3x$, missing an electric term?
Reading Jackson I had a doubt about the following (3th ed, p.178)
If a current density ${\bf J(x)}$ is in an external magnetic-flux density ${\bf B(x)}$, the elementary force law implies that the ...
- 584
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votes
1
answer
167
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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
56
views
For closed circuits, why can't we have more than one $f(r)$?
Force between current elements depends on a function of angles [$f(\eta, \theta, \theta^{\prime})$] and also on a function of distance between them [$f(r)$] .
For closed circuits, there are more ...
- 772
2
votes
2
answers
969
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Force on a current carrying conductor and Hall effect
If we consider a thin wire on which flows current, inside a magnetic field, we observe a force
$\mathbf{dF}=i\mathbf{ds} \land \mathbf{B}$ on each $\mathbf{ds}$ of the wire. This force is caused by ...
- 768
0
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1
answer
211
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Is Ampere's force law conservative?
Ampere's force law between current elements is:
$d^2\vec{F}=k\dfrac{1}{r^2}[\vec{ds}\times(\vec{ds'}\times\hat{r})]ii'$
Is this force field conservative?
$$OR$$
Does the work done to move $\vec{ds}...
- 137
0
votes
1
answer
451
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Forces between current carrying wires [closed]
Why the wires bearing current in the same direction don't attract to each other?
- 17
4
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2
answers
2k
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Two wires carrying current in same direction attract each other. But two proton beams repel each other. Why?
Why does two parallel currents attract each other when two proton beams repel each other?
- 49
2
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1
answer
362
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Current Loops VS Permanent Magnets
I'm having a hard time understanding the big connection between permanent magnets and current loops. I am aware that they both have the same magnetic field and therefore it can be said that a current ...
- 81
0
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1
answer
189
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Confusion in Maxwell's derivation of Ampere's Force Law - Part III
Note: This is not a duplicate of my previous questions with same title asked last year.
I am reading Maxwell's a treatise on electricity and magnetism, Volume 2, page 156 about "Ampere's Force Law".
...
- 772
3
votes
2
answers
2k
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What does "point of application of force" mean in the given context?
I faced a particular conceptual doubt while solving a textbook problem. I will initially write the complete question in my textbook and then try to boil it down to a single conceptual doubt so that it ...
user131786
2
votes
2
answers
10k
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What would happen to a motor without a split-ring commutator?
I realise that a similar question has already been asked (Why does the coil in this apparatus reverse its direction of oscillation?), however after reading the answers, I am still unclear on certain ...
- 69
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1
answer
1k
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Finding the force between parallel currents using the formula of magnetic pressure
Let there be two parallel current-carrying infinitely-long wires separated by $d$ carrying currents $i_1$ & $i_2$ respectively in the same direction.
In order to find the force on an ...
user36790
6
votes
3
answers
309
views
Would a solenoid move if a magnet went through it?
If you were to have a solenoid (0 current) floating still in space, and shot a magnet through it, would the solenoid move, or would it only create a DC current (what if it has a closed/open circuit)? ...
- 451
1
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1
answer
311
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How is Magnetic force on a current carrying conductor $Blb$
I was reading an answer about torque acting on a rectangular current carrying loop kept in a uniform magnitude field B.
Force acting on each sides is $F_1$, $F_2$, $F_3$, $F_4$.
It's written here : ...
- 133