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Q.

The surface tension of a liquid is 70 dyne $c m^{- 1}$ It may be expressed in MKS as $7 \times 10^{- n} N / m$ then $n$ is_______

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Detailed Solution

$70 d y n e c m^{- 1} = 70 \frac{d y n e}{c m} = \frac{70 \times 10^{- 5} N}{10^{- 2} m}$

$\Rightarrow 70 d y n e c m^{- 1} = 7 \times 10^{- 2} N m^{- 1}$

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The surface tension of a liquid is 70 dyne cm−1 It may be expressed in MKS as 7×10−nN/m then n is_______