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A straight piece of wire 4 cm long is pl...

A straight piece of wire 4 cm long is placed horizontally on the surface of water and is gently pulled up. It is found that a force of 560 dyne in addition to the weight of the wire is required for this purpose. Then surface tension of the water is.

A

`70 dyne//cm`

B

`44.8 dyne//cm`

C

`700 dyne//cm`

D

none

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