Question

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Answer 1

4th option is the correct answer

Answer 2

Answer:

Option "4" is Al right.

Explanation:

The upward force due to the change in pressure in the capillary.

F(up)=∆P*A =(2*S.T.*cos(angle of contact)/R)*πR^2 assuming angle of contact to be zero

=2*π*R*S.T.=(circumference)*(6*10^(-2))

This F(up)=75*10^(-4) From there you will get Circumference is 12.5*10^(-2)m.

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Hence Proved! That option 4 is Correct!