Establish a relation for shape factor for a conical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate

• A. 1 – d/ (4 h 2 + d) 1/2
• B. 1 – d/ (4 h 2 + d 2) 1/2
• C. 1 – d/ (4 h + d 2) 1/2
• D. 1/2b) 1 – d/ (4 h 2 + d 2) 1/2c) 1 – d/ (4 h + d 2) 1/2d) 1 – d/ (h 2 + d 2) 1/2