Correct Answer - Option 1 : B = μH
Magnetic field strength or field intensity (H) is the amount of magnetising force.
Magnetic flux density (B) is the amount of magnetic force induced on the given body due to the magnetising force H.
The relation between B and H is,
B = μH
Where, μ is the relative permeability
Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. It is the degree of magnetization that a material obtains in response to an applied magnetic field.
It is a constant of proportionality that exists between magnetic flux density and magnetic field intensity.
