MarSuper
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In free space does permeability increase or decrease when a magnetic field is applied?
Ferromagnetic materials have a non linear characteristic, so the slope changes with applied field, but free space is linear, so the permeability does not change.MarSuper said:I noticed while reading else where on the internet that certain materials have a relative permeability for the material. I was wondering since permeability increases in ferromagnetic materials when an external magnetic field is applied I was wondering if that was also true for free space.
It does no such thing. Gravitational time dilation will redshift light that is climbing up out of a gravity well and blueshift light that is falling into one, and gravitational lensing will change the direction that light is moving, but light always moves at ##c## in a vacuum. (If you think you've heard something else, chances are that you or your source are either misunderstanding or misrepresenting a coordinate velocity).MarSuper said:As an example the speed of light is a constant in free space until it encounters a gravitational field. Light slows down when it encounters a gravitational field.
Meir Achuz said:Pi is a mathematical number that can be defined by a definite integral or a power series. This number cannot be affected by a gravitational field.
If Einstein said anything, it was not that this number changed,
MarSuper said:I noticed while reading else where on the internet that certain materials have a relative permeability for the material. I was wondering since permeability increases in ferromagnetic materials when an external magnetic field is applied I was wondering if that was also true for free space.