A circular wire of length 0.1 m is touching the surface of the liquid of surface tension ` 3 xx 10^(-2)` N/m The mass of a wire is `10^(-4)` kg . If g = 10 `m//s^(2)` then the force needed to lift the circular wire isA. `7xx10^(-3)`NB. `0.7 xx 10^(-3)`NC. `0.07 xx 10^(-3)`ND. `70 xx 10^(-3)` N

A circular wire of length 0.1 m is touching the surface of the liquid

1.	A circular wire of length 0.1 m is touching the surface of the liquid of surface tension ` 3 xx 10^(-2)` N/m The mass of a wire is `10^(-4)` kg . If g = 10 `m//s^(2)` then the force needed to lift the circular wire isA. `7xx10^(-3)`NB. `0.7 xx 10^(-3)`NC. `0.07 xx 10^(-3)`ND. `70 xx 10^(-3)` N
Answer» Correct Answer - A `F = mg + T xx 2l = 10^(-4) xx 10 + 3 xx 10^(-2) xx 0.2 ` ` = 1 xx 10^(-3) + 6 xx 10^(-3) = 7 xx 10^(-3)` N

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A circular wire of length 0.1 m is touching the surface of the liquid of surface tension ` 3 xx 10^(-2)` N/m The mass of a wire is `10^(-4)` kg . If g = 10 `m//s^(2)` then the force needed to lift the circular wire isA. `7xx10^(-3)`NB. `0.7 xx 10^(-3)`NC. `0.07 xx 10^(-3)`ND. `70 xx 10^(-3)` N

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