Force Needed to Lift a Needle

Force needed to lift a needle Fs 3 W F=W+2F Fs F= we t 2Tl weight not given w=0 F= 2ID ?The length of needle fluat ing on water is 2.5cm . The minimum force acddition to it's weight needed to lift above the surface of water will be ?

ans: F - 2Tl =2x0.072 X 2.5 =3.6x10-3 36x10-4