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A soap bubble of radius `r` is placed on another bubble of radius `2r`. The radius of the surface common to both the bubbles is
A. `(2r)/(3)`
B. 3r
C. 2r
D. r

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1 Answers

Correct Answer - 3
`R_("eq")=(r_(1)r_(2))/(r_(2)-r_(1))=(2rxxr)/(2r-r)=2r`

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