Lessons

Eamcet Physics
1 st Year : Unit 7.4 ( Properties of Bulk Matter ) - Surface Tension - Surface Energy

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Q.

A uniform wire of 20 cm long is bent into a circle. It is placed gently on the surface of water of surface tension 0.07 Nm-1. The extra force than its weight required to pull it out of the water is

View Answer

Correct choice: B

Explanation:

l= 2πr = 20cm = 20x 10-2m
In the case of Ring
F = T x 2x2πr
F = 0.07 x2x20x10-2 = 0.028N
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