Answer:
If air gap dimension is less than or equal to 10% of the smallest dimension of the area,
the area must be increased by 2 x width of air gap in both directions.
eg. l=20mm,w=10mm
A=l x w,.02 x.01=0.0002m^2
If we are supposed to increase this area for eddy current phenomenon, we multiply
the area by 0.95 (0.0002m^2 X 0.95 =0.00019m^2)