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Byju's Answer
Standard XII
Physics
Applying NLM along 3 Axis
A 1 m long ...
Question
A
1
m
long uniform beam is balanced as shown. Calculate the force F.
A
2
N
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B
3
N
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C
7
N
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D
11
N
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Solution
The correct option is
D
11
N
Moment of force
M
=
force
×
perpendicular distance from pivot
For the balanced beam, the net moment of force on left side of pivot is equal to the net moment of force on right side.
Thus,
5
N
(
50
−
10
)
c
m
=
F
(
60
−
50
)
c
m
+
(
3
N
)
(
80
−
50
)
c
m
or
20
=
F
+
9
or
F
=
11
N
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