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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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