How Far Does a Magnetic Field Extend?

[Xion]

Hey, I am sure how to answer this question,

How far does the magnetic field of force extend?

Thanks.

 

[HallsofIvy]

Forever, and ever, and ever, and ever, ...

(F decreases as 1/r² and that is never 0 no matter how large r is.)

 

[M98Ranger]

The magnetic field of force extends indefinitely, as it is a fundamental force of nature. However, the strength of the magnetic field decreases as you move further away from its source. The exact distance that the magnetic field extends depends on the strength of the source and the surrounding environment. In general, the magnetic field can be detected and measured up to several meters away from its source.