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# Mu Naught Value

Mu naught or µ0 is the permeability constant and is synonymous to the permeability of free space or as magnetic constant. Mu naught value is the measure of the amount of resistance offered against the formation of the magnetic field in vacuum. It is often misspelt as mu not instead of mu naught.

## Value Of Mu Naught

The value of mu naught(µ0) or the value of absolute permeability of free space had the exact defined value until 20 May 2019.

Until 20 May 2019,

• mu naught value: µ0 = 4π × 10-7 H/m
• approximated to µ0 = 12.57 × 10-7 H/m

However, on 20 May 2019 a revision to the SI system took place, making the vacuum permeability no longer a constant but rather a value that needs to be determined experimentally. A recently measured value of mu naught in the system is 4π × 1.00000000082(20)×10-7 H⋅m-1

### Mu Naught Unit

The units in physics are the different scales to measure an entity. The value of mu naught is measured using henries per metre which is equivalent to newton(kg.m/s2) per ampere squared(N.A-2).

Hope you got to know the Mu naught value along with Mu naught unit in SI in physics.

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