Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Water is dropped at the rate of 
. into a cone of semi-vertical angle 
. The rate at which periphery of water surface changes when height of the water in the cone is 2 meter, is
A
.
B
. C
.
D
.
Text Solution
Verified by ExpertsThe correct answer is:
A
We have 
[Here 
, as 
]
……… (i)
Now, perimeter 
(let)
…… ..(ii)
(Using equation (i))
When 
meters 
meters
Hence 
.
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