All Questions
10
questions
2
votes
2
answers
223
views
Is a moving electret considered a current, and would spinning one make a magnet?
If I establish a permanent electric charge on some volume of material (as in an electret) and then move that material through space — is that motion equivalent to a current in a wire?
Also, since a ...
- 370
1
vote
0
answers
22
views
Electrons crossection distribution inside a direct current wire
If electrons of a DC flow feel mutual magnetic field that should move them towards the center of the wire and in that case their accumulation in the center cause electric repulsion should there be a ...
- 2,255
0
votes
1
answer
33
views
How do magnetic fields due to random motions of charges cancel out in a current-carrying wire?
In my physics textbook, it states that
magnetic fields due to random motions of charges cancel out at every point
I know there's a drift velocity due to force imposed by the electric field, but the ...
- 81
0
votes
2
answers
1k
views
What direction is current for an electron in both $E$ and $B$ fields?
According to Fleming's left hand rule:
I am a bit confused however in the case of an electron travelling in a region of both electric and magnetic fields, which direction would the electric current ...
- 167
-2
votes
3
answers
129
views
Do magnetic lines of force depict path of moving charges [closed]
What are the magnetic field lines basically depicting in terms of moving charges or charge carrier particles or currents.
What do those circular loops around a straight current carrying wire actually ...
4
votes
1
answer
198
views
Why is the magnetic field dependent on the current inside the Amperian Loop?
I visited this website simulating the magnetic field inside and around a pipe. I understand that there is no current flowing at the center of the pipe, thus there is no magnetic field generated ...
- 155
3
votes
2
answers
978
views
Why is the magnetic field created? [duplicate]
From Oersted experiment we know " When an electric current is passed through a conducting wire, a magnetic field is produced around it." An electric current is a flow of electric charge or electron. ...
1
vote
1
answer
537
views
Why does the axle need to be rotated in a turbine generator?
Inside a turbine a wire rotates between the poles of a magnet, i.e. rotating inside the magnetic field, so that the field forces the electrons in the wire to move and generate current. But why does ...
- 1,925
5
votes
2
answers
3k
views
Is Magnetism and Electromagnetism the Same Thing?
I keep hearing everywhere that magnetism and electromagnetism are different but is seems to me that when a current is moving and it creates a "magnetic field", it is just electrons repulsing other ...
- 153
0
votes
1
answer
244
views
Foucault currents with a simple pendulum
I have this diagram :
It's a kind of pendulum; when it swings, it passes through a small aera where there is a magnetic field. Therefore, the electrons moves towards the bottom because of a Lorentz ...
- 167