Wb/m2 is a unit to define the intensity of magnetic field.
The tesla is the value of the total magnetic flux divided by area.
Hence, reducing the affected area will generally increase the magnetic flux density.
The tesla (symbol T) is the SI derived unit of magnetic flux density. 1T=1Wb/m2 1 tesla is equivalent to 10000 gauss. While dyne is unit of force in CGS system, watt is unit of power, and henry is the SI unit of inductance.