A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended from the rod at 20 cm and another unknown mass ' 
' is suspended from the rod at 160 cm mark as shown in the figure. Find the value of ' 
' such that the rod is in equilibrium. ( 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given that
Mass of 
; Length of 
If the rod is in equilibrium, the net torque about point 
will be zero.
Torque at point 
due to 2 kg mass,
Torque due to mass of rod,
Torque due to mass 
,
Net torque about point 
should be zero.
So, 
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