The unit of surface energy per unit area may be expressed as

N m^{- 2}

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N m^{- 1}

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N m

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N m^{2}

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Solution

The correct option is B $N m^{- 1}$
Surface energy per unit area is the measure of surface tension.
Surface tension $= \frac{F o r c e}{l e n g t h} = \frac{N}{m}$ .
Thus the unit of surface energy per unit area may be expressed as $N m^{- 1}$ .

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