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AIIMS 2018 May 26 Physics Evening Question Paper with solutions for online practice
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Question : 4
Total: 40
A needle of length l m and mass m kg is placed horizontally on water surface having surface tension T. Find T in terms of m, l. (g acceleration due to gravity)
T
=
m
g
2
l
T
=
m
g
l
T
=
3
m
g
2
l
T
=
m
2
l
Validate
Solution:
2
T
cos
θ
=
m
g
T
=
m
g
2
c
o
s
θ
θ is very small
T
=
m
g
2
l
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