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Question

A spherical soap bubble of radius 1cm is formed inside another soap bubble of radius 3cm. The radius of a single soap bubble which maintains the same pressure difference as inside the smaller and outside the larger soap bubble as

A
0.75cm
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B
0.75m
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C
7.5cm
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D
7.5m
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Solution

The correct option is A 0.75cm
Excess pressure inside a soap bubble =4Tr
where r is the radius of the bubble.
Hence

4T3+4T1=4TR

3×13+1cm
R=0.75cm

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