A metre stick is balanced on a knife edge at its centre. When two coins, each of mass 5 g are put one on top of the other at the 12 cm mark, the stick is found to be balanced at 45 cm. The mass of the metre stick is
Text Solution
Verified by ExpertsThe correct answer is:
B
Let m be the mas of the metre stick concentrated at C, the 50 cm mark as shown in the figure.
In equilibrium, taking moments of forces about C’ we get
10g (45-12) = mg (50-45)
10 g × 33 = mg × 5
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