Question
Thu March 18, 2010 By:

Very Confusing!!

Expert Reply
Thu March 18, 2010

A = πR2, Hence if R becomes 2R area becomes 4A.

RA = ρL/A; RB = ρ(2L)/(4A) = ρL/2A

Hence RB = 2RA

Req = RARB/(RA+RB) = 2RA2/3RA = 2RA/3

Therefore, Req/RA = 2/3

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