Question

A drop of water is squeezed between two glass plates and is found to spread in the form of a circle of radius R. The force needed to pull plates apart is found to be F. Now the plates are pressed towards each other such that the water spreads in the form of circle of radius 2R. The force needed to pull the plates apart now will be
1) 4F
2)2F
3)8F
4)16F​

Answer 1

2f

if its wrong i'm sorry mate

Answer 2

The correct answer is option (2) 2F.

Explanation:

• A drop of water is squeezed between two glass plates and is found to spread in the form of a circle of radius R.
• The force needed to pull plates apart is found to be F.
• Now the plates are pressed towards each other such that the water spreads in the form of circle of radius 2R.
• The force needed to pull the plates apart now will be 2F.