A) 0.06 g
B) 0.6 g
C) 6g
D) 60g
Correct Answer: B
Solution :
The weight of straw will be balanced by the force of surface tension. Let the mass of straw is m, then \[mg=2\,Tl\] or \[m=\frac{2Tl}{g}\] \[=\frac{2\times 3\times {{10}^{-2}}\times {{10}^{-2}}}{9.8}kg\] \[=0.6\,g\]
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