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A glass plate of length 20 cm and breadt...

A glass plate of length 20 cm and breadth 0.2 cm just touches the water surface in a beaker. The surface tension of water is 72 dyne/cm. The weight of the glass plate is 25 g. The weight that must be placed in the right pan to counter pose the balance is

A

25 g

B

28 g

C

22 g

D

21.3 g

Text Solution

Verified by Experts

The correct Answer is:
B
`"Force "=2(l+b)T="3 g nearly"`
`"Total weight "=25+3=28g`
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