What is the logarithmic mean of r1 and R2 ?
A) (r1 - R2 ) /ln(r1/R2 )
B) (r1 - R2 ) /ln(R2 /r1)
C) (R2 - r1) /ln(r1/R2 )
D) (r1 - R2 ) /-ln(r1/R2 )
Correct Answer:
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