A pulley is attached to one arm of a balance and a string passed round it carries two masses m 1 and m 2 . The balance is counter poised and the pulley is clamped so that m 1 and m 2 do not move. How much counter weight is to be reduced or increased to restore balance if the clamp is released?
A
to be reduced
B
to be increased
C
to be reduced
D
to be increased
Text Solution
Verified by ExpertsThe correct answer is:
A
When pulley is clamped (or masses are stationary)
W 1 = (m 1 + m 2 ) g ....(i)
When clamp is removed,
W 2 = 2T = 
....(ii)
W = W 1 – W 2 = 
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