What is the formula for the copper area of the field windings?

• A. copper area = full load field mmf * current density in the field winding
• B. copper area = full load field mmf / current density in the field winding
• C. copper area = full load field mmf + current density in the field winding
• D. copper area = full load field mmf ‚Äö√Ñ√∂‚àö√ë‚àö¬® current density in the field winding