A straight piece of wire 5 cm long is placed horizontally on
the surface of water and is gently pulled up. It is found that
a force of 728 dyne in addition to the weight of the wire is
required for the purpose. What is the surface tension of the
water?
(1) 0.72 dyne/cm
(2) 72.8 dyne/cm
(3) 72.8 Nm
(4) 72.8 dyne/m
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Answer: answer will be 72.8 dyne /sec
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