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Q.

A thin square plate of side 5 cm is suspended vertically from a balance so that lower side just dips into water with side to surface. When the plate is clean (θ :0o), it appears to weigh 0.044 N. But when the plate is greasy (θ =180o), it appears to weigh 0.03 N. The surface tension of water is

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a

3.5 x 10-2 N/m

b

7.0 x 10-2 N/m

c

14.0 x 10-2 N/m

d

1.08 N/m

answer is B.

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Detailed Solution

Difference in apparent weights is due to differences in forces of surface tension. Due to 180o, the force surface tension in one case is opposite to the force of surface tension in the other case.∴ 2×σw×10100=0.004−0.03 or σw×0.0141×5N/m=0.07N/m=7×10−2N/m

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