All Questions
33
questions
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
4
votes
2
answers
2k
views
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
3
votes
2
answers
2k
views
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
3
votes
2
answers
4k
views
Does a current-carrying wire running through the centre of a solenoid experience force?
Imagine looking at a solenoid from above. Current passing is through it in a clockwise direction. The direction of the field lines therefore is towards the bottom of the solenoid.
Now pass a straight ...
- 139
3
votes
2
answers
735
views
Contradicting forces on a circular loop under current in magnetic field?
I have the following general conceptual concern.
Think of a thin conducting loop of radius $R$ placed in the $x$-$y$-plane at $z=0$. There is a homogeneous current density $\vec{j}$ running through ...
- 1,517
2
votes
4
answers
2k
views
Why in $F = iLB$, $L$ is a vector but $i$ is not?
I learned $F = iLB$ recently. However, I don't understand why $L$ is marked as a vector but $i$ is not.
For a normal rod, how should I define the direction of length vector $L$? And if I reverse the ...
- 123
2
votes
2
answers
969
views
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
2
votes
2
answers
10k
views
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
2
votes
1
answer
1k
views
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
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
2
votes
1
answer
362
views
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
2
votes
1
answer
296
views
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
1
vote
3
answers
250
views
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
1
vote
2
answers
36
views
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
1
vote
4
answers
208
views
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