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Surface Tension

Angle of cont...

Question

Angle of contact of water on oily surface is:

acute

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obtuse

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90^{0}

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0^{0}

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Solution

The correct option is B obtuse
$A n s w e r : -$ B
Water will behave as hydrophobic on oily surface so in figure we see that angle is greater than 90 degrees so obtuse.

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sec A = csc A

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