gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
100108-2146 EST
steve66:
Consider this:
An infinitely large square loop conductor closed by a voltmeter.
Thus you have your closed path.
A small 1" square coil 1" from a side of the large coil.
A switch and battery in series with the 1" coil.
Switch open and no magnetic flux exists around either wire.
Switch closes and a magnetic field expands out from the 1" coil linking a small portion of the large coil inducing a voltage pulse.
Reduce the large coil to 1,000,000 miles. The induced voltage will be insignificantly different.
The major voltage distribution along a portion of the large coil will be mostly in a 1" to 2" region along the large coil.
So whether the large coil is closed or not the voltage exists in the small region of the wire close to the small coil.
.
steve66:
Consider this:
An infinitely large square loop conductor closed by a voltmeter.
Thus you have your closed path.
A small 1" square coil 1" from a side of the large coil.
A switch and battery in series with the 1" coil.
Switch open and no magnetic flux exists around either wire.
Switch closes and a magnetic field expands out from the 1" coil linking a small portion of the large coil inducing a voltage pulse.
Reduce the large coil to 1,000,000 miles. The induced voltage will be insignificantly different.
The major voltage distribution along a portion of the large coil will be mostly in a 1" to 2" region along the large coil.
So whether the large coil is closed or not the voltage exists in the small region of the wire close to the small coil.
.