A needle of 12 cm long is a 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))

A needle of 12 cm long is a on the surface of water. The extra force r

1.	A needle of 12 cm long is a 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))
Answer» 72N 0.864N 0.0173N 7.2N Answer :C