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Q.

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

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a

2

b

3/4

c

1/2

d

4/3

answer is B.

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Detailed Solution

From the question the excess pressure inside the soap bubble,4Tr

Thus, Pressure inside 1cm bubble is given by

4T3+4T1=4TR ⇒3+13×1=1R ⇒R=34

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