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A bottle has an opening of radius a and length b. A cork of length b and radius `(a+Delta A)` is compressed to fit into the opening completely (See figure). If the bulk modulus of cork is B and frictional coefficient between the bottle and cork is  then the force needed to push the cork into the bottle is :

A

`(2pimuBb)Deltaa`

B

`(pimuBb)Deltaa`

C

`(4pimuBb)Deltaa`

D

`(pimuBb)a`

Text Solution

Verified by Experts

The correct Answer is:
C
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ALLEN -ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 5 A (Previous year Questions)
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