The length of a needle floating on water is 2.5 cm. The minimum force in addition to its weight…

Q: The length of a needle floating on water is 2.5 cm. The minimum force in addition to its weight needed to lift the needle above the surface of water will be (surface tension of water is 0.072 N/m)

(a) 3.6× 10-3 N

(b) 10-2 N

(c) 9 × 10-4 N

(d) 6 × 10-4 N

Ans: (a)

Author: Rajesh Jha

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