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(C) The correct option is $C$.When an iron needle is placed gently on the surface of water,it does not sink because the surface tension of the water a

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Of surface tension

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(C) The correct option is $C$.When an iron needle is placed gently on the surface of water,it does not sink because the surface tension of the water acts as a membrane.The surface tension force $F$ acts along the contact line of the needle with the water surface. The vertical component of this force,$2F \sin 	heta$,acts upwards and balances the weight of the needle $mg$,where $	heta$ is the angle of contact.Thus,in equilibrium: $2F \sin 	heta = mg$.

An iron needle slowly placed on the surface of water floats because

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