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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.
Permeability in free space is a physical constant that measures the ability of a material to allow a magnetic field to pass through it. It is denoted by the symbol μ₀ and has a value of approximately 4π x 10^-7 H/m.
Permeability in free space is directly related to the strength of a magnetic field. Materials with high permeability, such as iron, allow a greater magnetic field to pass through them, while materials with low permeability, such as air, do not allow as much magnetic field to pass through.
Permeability in free space is a universal constant that does not change, while permeability in a material can vary depending on the type of material and its properties. This means that different materials will have different levels of permeability and will allow different amounts of magnetic field to pass through.
Permeability in free space is typically measured using a device called a permeameter. This device uses a magnetic field to induce a voltage in a material, and the resulting magnetic field strength is used to calculate the material's permeability.
Permeability in free space is an important constant in many areas of scientific research, particularly in the fields of electromagnetism and materials science. It helps scientists understand and predict the behavior of magnetic fields in different materials, which is crucial in many technological applications and experiments.