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A soap bubble of radius r is placed on a...

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

Text Solution

Verified by Experts

The correct Answer is:
3
`R_("eq")=(r_(1)r_(2))/(r_(2)-r_(1))=(2rxxr)/(2r-r)=2r`
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