Relationship between static electric field and electromagnet

[Jackson Lee]

Hey,guys. I was confused by the building process of static electric field.There must exist some process building static electric field in the space. But what create it? How much time is needed? Is there any relationship with electromagnetic waves? Any one know this

 

[Jackson Lee]

Actually, I know the electrostatic field propagate at the speed of light, but why?

 

[jtbell]

Actually, the electrostatic field doesn't propagate. It simply exists. What propagates are changes in the electric (and magnetic) field, and these propagate at speed c in vacuum according to Maxwell's equations. An electromagnetic wave is simply a periodic change in electric and magnetic fields, which also propagates at speed c.

 

[Jackson Lee]

Actually, the electrostatic field doesn't propagate. It simply exists. What propagates are changes in the electric (and magnetic) field, and these propagate at speed c in vacuum according to Maxwell's equations. An electromagnetic wave is simply a periodic change in electric and magnetic fields, which also propagates at speed c.

Thanks, I think I got it.