Question

what do u mean by Tesla ?

what do u mean by permeability of vaccum ?

^_^

Answer 1

Tesla:
The unit for magnetic field in SI system is Tesla.
Permeability of vacuum:
The permeability of vacuum is a physical constant. Its value is $1.257\times {10}^{-6}\mathrm{henry}/\mathrm{m}$ . It is represented as ${\mathrm{\mu }}_0$ . This constant exists between magnetic flux density and magnetic field strength in a given medium.