1.

Shape factor for sphere is

A. 4 π r <sub>1</sub> r <sub>2</sub>
B. 4 π r <sub>1</sub> r <sub>2</sub>/r <sub>2 </sub>– r <sub>1</sub>
C. 4 π /r <sub>2 </sub>– r <sub>1</sub>
D. r <sub>1</sub> r <sub>2</sub>/r <sub>2 </sub>– r <sub>1</sub>
Answer» C. 4 ‚âà√¨‚àö√ë /r <sub>2 </sub>‚Äö√Ñ√∂‚àö√ë‚àö¬® r <sub>1</sub>


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