Maker Pro
Maker Pro

superconducting wire questions

K

Ken Williams

Jan 1, 1970
0
If I have a normal copper wire and I run electricity through it a
magnetic field is produced around the wire.

1) If the wire is super conducting there should be no magnetic field
correct?

2) Is the magnetic field produced in a copper wire proportional to the
wire's resistance somehow?
 
C

Charles

Jan 1, 1970
0
Ken Williams said:
If I have a normal copper wire and I run electricity through it a magnetic
field is produced around the wire.

1) If the wire is super conducting there should be no magnetic field
correct?

2) Is the magnetic field produced in a copper wire proportional to the
wire's resistance somehow?

Super conductors are used in accelerators and they have an awesome magnetic
field. Resistance limits current flow which limits the field intensity.
 
S

Sjouke Burry

Jan 1, 1970
0
Ken said:
If I have a normal copper wire and I run electricity through it a
magnetic field is produced around the wire.

1) If the wire is super conducting there should be no magnetic field
correct? NO

2) Is the magnetic field produced in a copper wire proportional to the
wire's resistance somehow?
NO
 
B

Bob Myers

Jan 1, 1970
0
Ken Williams said:
If I have a normal copper wire and I run electricity through it a magnetic
field is produced around the wire.

1) If the wire is super conducting there should be no magnetic field
correct?

2) Is the magnetic field produced in a copper wire proportional to the
wire's resistance somehow?

No and no. The magnetic field surrounding a conductor -
or even that due to a stream of electrons in free space - is
proportional to the current, which simply put is the amount of
charge "flowing" past a given point per unit time. In other
words, the magnetic field is proportional to the rate at which
charge is being transferred along a given path.

A superconducting wire carrying, say, 1A of current would
have exactly the same field surrounding it as a conventional
conductor carrying the same current. What it would lack,
due to the lack of resistance in the conductor, is a *voltage*
drop from end to end.

Bob M.
 
Top