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Two soap bubbles of radii r(1) and r(2) ...

Two soap bubbles of radii `r_(1)` and `r_(2)` equal to 4 cm and 5 cm are touching each other over a common surface `S_(1)S_(2)` (shown in figure). Its radius will be

A

4 cm

B

20 cm

C

5 cm

D

4.5 cm

Text Solution

Verified by Experts

The correct Answer is:
B
`r=(r_1r_2)/(r_2-r_1)=(4xx5)/(5-4)=20 cm`
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