What is flux density formula?

Answer: There are  two different types of flux density formulas they are Electric flux density and magnetic flux density are both included. 

Magnetic flux:

It is the measurement of the total magnetic field that passes through a given volume.

Magnetic flux = Φ = BA

Here,

A is the magnetic field’s cross-sectional area, measured in square meters (m²). The Tesla is the SI unit (T).

Electric flux volume

The number of electric lines of force  that cross a specific area is a property of an electric field.

Electric flux = Φ = E A Cosθ