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 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
`(pimuB b )Delta a `
B
`(4pimu Bb)Delta a`
C
`(2pimuBb)Delta a`
D
`(pimuBb)a`
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