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There is a small hole in a hollow sphere...

There is a small hole in a hollow sphere. The water enters in it when it is taken to a depth of 40 cm under water. The surface tension of water on 0.07 N/m, The diameter of hole is,

A

7mm

B

0.07mm

C

0.0007mm

D

0.7mm

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The correct Answer is:
B
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