Q.
Find the maximum weight of needle which can float on water having surface tension 0.073 N/m if length of needle is 4 cm.
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a
0.58 kg
b
0.584 kg
c
1.3 g
d
1.3 kg
answer is B.
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Detailed Solution
2TL=mg⇒m=2TLg=0.584 g
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