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Old Apr 29th 2015, 08:11 AM   #1
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maxwell equations

1. Why only changing magnetic fields cause currents . i want theoretical explanation not mathematical.
2. i hav current carrying loop as shown in fig . and soild conductor placed inside the loop . both ends of conductor are connected to complete the loop . what will be the directions of changing magnetic field due to coil and induced magnetic field due to induced current in conductor.maxwell equations-current.png

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Old Apr 29th 2015, 01:05 PM   #2
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Originally Posted by imransaeed View Post
1. Why only changing magnetic fields cause currents . i want theoretical explanation not mathematical.
2. i hav current carrying loop as shown in fig . and soild conductor placed inside the loop . both ends of conductor are connected to complete the loop . what will be the directions of changing magnetic field due to coil and induced magnetic field due to induced current in conductor.Attachment 1371
1. Electric fields also create currents. This comes from the Lorentz force: The electric field produces a force on the electron and hence a current.

2. Use Lenz law on this one. The coil will produce a force on the free electrons in the metal and they will move along the axis. The resulting magnetic field will cause a "back current" in the coil opposite to the direction of the current in the coil.

I'm not sure if I completely answered #2. Let me know if I didn't.

-Dan
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Old Apr 30th 2015, 03:44 PM   #3
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Firstly the electric field and the magnetic field are just different aspects of the same thing, the electromagnetic field.
It's a bit like looking at the same thing, but from a different angle.

All the electrons (protons, and any other electrically active entities) in a material have an electro/magnetic field associated with them.
These individual fields all overlap and combine to create a single stable field.

If we start to move some of the electrons relative to some of the others, then this field is pulled out of stability, and the electrons are pulled along to try and restore the stability.
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