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Work done in increasing the size of a so...

Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly (surface tension of soap solution= 0.03 `Nm^(-1)`)

A

`0.2pimJ`

B

`2pimJ`

C

`0.4pimJ`

D

`4pimJ`

Text Solution

Verified by Experts

The correct Answer is:
C
`W=2T4pi[(5^(2))-(3)^(2)]10^(-4)`
`=2T4pi[(5^(2))-(3)^(2)]10^(-4)`
`=2xx0.03xx4pi[25-9]xx10^(-4)J=0.4pimJ`
Correct choice : ( c)
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Knowledge Check

  • The amount of work done in increasing the size of a soap film 10 cm x 6 cm to 10 cm x 10 cm is (surface tension T = 0·030 Nim) :

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