Is there any effect of wire's insulation on it's magnetic an

  • Thread starter dumbboy340
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  • #1
Does insulation affect electric and magnetic field?
 

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  • #2
Bystander
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What's the purpose of insulating a wire?
 
  • #3
That is what i'm asking.If it does,why a magnet interacts it?i'm confused.please explain it??
 
  • #4
davenn
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Insulation does affect the EM propagation speed along the outside of a wire
This becomes very apparent with transmission lines ( antennas) that have either a covering
The result is a slowing of the EM propagation, This is known as the VF -- Velocity Factor

Dave
 
  • #5
davenn
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I'm not sure that a magnetic field on its own is affected by insulation
That I would have to research
 
  • #6
berkeman
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That is what i'm asking.If it does,why a magnet interacts it?i'm confused.please explain it??

Why do you think a magnetic field interacts with insulation? It does not. As stated already, insulation has a higher dielectric constant than air, so it will affect the E field generated by voltages on the wire (including the velocity factor that Dave has mentioned).
 
  • #9
TheDemx27
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I guess if you're counting a sheath (like in coaxial cable) as the insulation, then it certainly affects the [itex]B[/itex] field produced by the wire because the metal intentionally has high permeability. Otherwise plastic wouldn't have a noticeable effect.
 

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