Equipotential surface magnetic field

[Maike]

Homework Statement

True or not true:[/B]
Equipotential surfaces of the magnetic field are no closed surfaces but extend to infinity

Homework Equations

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The Attempt at a Solution

I think it is true, because they are perpendicular to the (closed) magnetic field lines, but I am not sure...

 

[Simon Bridge]

How would you find out?

 

[Maike]

How would you find out?

That's my problem... :( No idea