When oil is placed on the surface of hot water, formation of droplets takes place because

surface tension of hot water

=

surface tension of oil

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surface tension of hot water

<

surface tension of oil

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surface tension of hot water

>

surface tension of oil

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none of the above

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Solution

The correct option is C none of the above
When oil is placed on the surface of hot water, formation of droplets takes place because surface tension of hot water $\neq$ surface tension of oil. When surface tensions of two liquids are not equal a boundary exists between two phases.

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T_{1}

T_{2}

r_{1} = 10 c m

r_{2} = 5 c m

= g = 10 m s^{- 2}

8

0.5 m m

72 d y n e c m^{- 1}

7 \times 10^{- 2} N / m; π = \frac{22}{7})

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