What is the formula of the cross winding area of the magnet coils?

• A. cross winding area = axial length of coil + depth of winding
• B. cross winding area = axial length of coil ‚Äö√Ñ√∂‚àö√ë‚àö¬® depth of winding
• C. cross winding area = axial length of coil * depth of winding
• D. cross winding area = axial length of coil / depth of winding