Question

Surface Tension
37. A needle of 12 cm long is on the surface of
water. The extra force required, over its weight,
to take it out from the surface of water is (surface
tension = 72 dyne cm-?)
1) 72N
2) 0.864N
3) 0.0173N
4) 7.2N
Show me process plz

Answer 1

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Answer 2

The Ans is in Newton...........