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Question
The quantity d t/Q for conduction of heat through a body i.e. spherical in shape is
Options:
A .  ln (r2/r1)/2πLk
B .  ln (r2/r1)/πLk
C .  ln (r2/r1)/2Lk
D .  ln (r2/r1)/2πk
Answer: Option A
Answer: (a).ln (r2/r1)/2πLk
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