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Question
Physics
The force required to take away a flat circular plate of radius 5 cm on the surface of water, will be: (surface tension of water =75× 10-3N/m )
Q. The force required to take away a flat circular plate of radius
5
c
m
on the surface of water, will be : (surface tension of water
=
75
×
10
−
3
N
/
m
)
2740
200
Haryana PMT
Haryana PMT 1999
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A
3.5
N
B
7.5
π
×
10
−
3
N
C
15
π
×
10
−
3
N
D
none of these
Solution:
Using the relation,
F
=
T
L
=
T
×
2
π
R
Here,
R
=
5
c
m
=
5
×
10
−
2
m
T
=
75
×
10
−
3
N
/
m
or
F
=
75
×
10
−
3
×
2
×
π
×
5
×
10
−
2
So,
F
=
7.5
π
×
10
−
3
N